jsc2024e005699 (Jan. 9, 2024) --- NASA astronaut Chris Williams poses for a photo in front of a T-38 jet at Ellington Field in Houston, Texas.

jsc2024e055523 (Aug. 13, 2024) --- NASA astronaut Chris Williams participates in spacewalk training at the Neutral Buoyancy Lab at NASA’s Johnson Space Center in Houston, Texas.

jsc2024e055545 (Aug. 13, 2024) --- NASA astronaut Chris Williams participates in spacewalk training at the Neutral Buoyancy Lab at NASA’s Johnson Space Center in Houston, Texas.

jsc2024e055570 (Aug. 13, 2024) --- NASA astronaut Chris Williams participates in spacewalk training at the Neutral Buoyancy Lab at NASA’s Johnson Space Center in Houston, Texas.

jsc2024e018416 (March 5, 2024) --- NASA astronaut Chris Williams participates in media interviews shortly after his graduation as an astronaut in Houston, Texas.

jsc2025e044433 (May 6, 2025) --- NASA astronaut Chris Williams poses for a photo in an Extravehicular Mobility Unit spacesuit during vacuum chambers testing at NASA’s Johnson Space Center in Houston, Texas.

jsc2025e044425 (May 6, 2025) --- NASA astronaut Chris Williams poses for a photo in an Extravehicular Mobility Unit spacesuit during vacuum chambers testing at NASA’s Johnson Space Center in Houston, Texas.

Astronaut Candidate Individual Portrait, Chris Williams - ASCAN Class of 2021. Photo Date: December 3, 2021. Location: Building 8, Room 183 - Photo Studio. Credit: NASA/Robert Markowitz

jsc2025e060543 (June 24, 2025) --- NASA astronaut Chris Williams prepares for takeoff in the backseat of a T-38 jet, departing out of Ellington Field in Houston, Texas.

jsc2025e060539 (June 24, 2025) --- NASA astronaut Chris Williams (left) speaks with pilot John Gustine ahead of their flight on a T-38 jet out of Ellington Field in Houston, Texas.

jsc2024e077054_alt (Aug. 7, 2025) --- NASA astronaut and Expedition 74 Flight Engineer Chris Williams poses for a portrait in his flight suit at NASA's Johnson Space Center in Houston, Texas. Credit: NASA/James Blair

jsc2024e055706 (Aug. 16, 2024) --- NASA astronaut Chris Williams participates in a training at the Food Lab at NASA’s Johnson Space Center in Houston, Texas, in preparation for his mission to the International Space Station.

jsc2025e045121 (May 14, 2025) --- NASA astronaut Chris Williams participates in a training session at the Space Vehicle Mockup Facility at NASA’s Johnson Space Center in Houston, Texas, to prepare for the unlikely event of an emergency during his International Space Station mission.

jsc2024e074749 (Nov. 13, 2025) --- NASA astronaut Chris Williams participates in a training session at the Space Vehicle Mockup Facility at NASA’s Johnson Space Center in Houston, Texas, to prepare for the unlikely event of an emergency during his International Space Station mission.

jsc2025e033530 (Feb. 10, 2025) --- NASA astronaut and Soyuz MS-27 Backup Flight Engineer Chris Williams poses for a portrait in his Sokol launch and entry suit at the Gagarin Cosmonaut Training Center in Star City, Russia.

jsc2025e074497 (Jan. 16, 2025) --- NASA astronaut and Soyuz MS-28 Mission Specialist Chris Williams poses for a portrait in his Sokol launch and entry suit at the Gagarin Cosmonaut Training Center in Star City, Russia. Credit: GCTC

iss074e0404626 (March 18, 2026) -- NASA astronaut Chris Williams is pictured outside the International Space Station during a seven-hour, two-minute spacewalk on March 18, 2026. Credit: NASA/Jack Hathaway

jsc2024e074755 (Nov. 13, 2025) --- NASA astronauts Chris Williams (left) and Mike Fincke (right) participate in a training session at the Space Vehicle Mockup Facility at NASA’s Johnson Space Center in Houston, Texas, to prepare for the unlikely event of an emergency during their International Space Station mission.

iss074e0590844 (May 13, 2026) --- NASA astronaut and Expedition 74 flight engineer Chris Williams poses aboard the International Space Station’s Kibo laboratory module with a free‑flying robotic camera developed by JAXA (Japan Aerospace Exploration Agency) that could assist astronauts with video and photography activities. Credit: NASA/Chris Williams

iss074e0325940 (Feb. 25, 2026) --- NASA astronaut and Expedition 74 flight engineer Chris Williams works inside the International Space Station's Kibo laboratory module. Williams opened up Kibo's multi-purpose small payload rack to install and configure advanced robotics hardware for the TUSK (Test facility for lab-aUtomation System in Kibo) technology demonstration. TUSK is demonstrating precision mobility and experiment automation in microgravity using a pair of small robotic arms to reduce crew workloads. Credit: NASA/Chris Williams

iss074e0326337 (Feb. 25, 2026) --- NASA astronaut and Expedition 74 flight engineer Chris Williams works inside the International Space Station's Kibo laboratory module. Williams opened up Kibo's multi-purpose small payload rack to install and configure advanced robotics hardware for the TUSK (Test facility for lab-aUtomation System in Kibo) technology demonstration. TUSK is demonstrating precision mobility and experiment automation in microgravity using a pair of small robotic arms to reduce crew workloads. Credit: NASA/Chris Williams

iss074e0590846 (May 12, 2026) --- NASA astronaut and Expedition 74 flight engineer Chris Williams inserts a cryogenic storage unit, called a dewar, into a science freezer aboard the International Space Station’s Kibo laboratory module. Earlier, Williams had loaded the dewar with ice bricks that help keep scientific samples extremely cold inside the ultra‑cold freezer, known as the Minus Eighty‑Degree Laboratory Freezer for the International Space Station, or MELFI. Credit: NASA/Chris Williams

iss074e0603176 (May 19, 2026) --- NASA astronaut and Expedition 74 flight engineer Chris Williams works inside the International Space Station’s Kibo laboratory module on the Space Cancer Therapeutics investigation. Williams was processing samples to study how microgravity affects an anti‑cancer drug and the drug’s molecular behavior, research that may help develop more effective treatments for pancreatic cancer both on Earth and in space. Credit: NASA/Chris Williams

iss074e0402919 (March 18, 2026) -- NASA astronaut Chris Williams is pictured outside the International Space Station during a spacewalk to complete the build and installation of a modification kit ahead of future solar array installation on the 2A power channel of the space station. It was William’s first spacewalk of his career, and the 278th in support of space station maintenance, upgrades, and assembly. Credit: NASA/Jessica Meir

iss074e0402919 (March 18, 2026) -- NASA astronaut Chris Williams is pictured outside the International Space Station during a spacewalk to complete the build and installation of a modification kit ahead of future solar array installation on the 2A power channel of the space station. It was William’s first spacewalk of his career, and the 278th in support of space station maintenance, upgrades, and assembly. Credit: NASA/Jessica Meir

iss074e0404601 (March 18, 2026) --- NASA astronaut and Expedition 74 flight engineer Chris Williams is pictured outside the International Space Station during a spacewalk to complete installation of a modification kit ahead of future solar array installation on the 2A power channel of the orbital outpost. It was William’s first spacewalk of his career, and the 278th in support of space station maintenance, upgrades, and assembly. Credit: NASA/Jack Hathaway

iss074e0374826 (March 9, 2026) --- NASA astronaut and Expedition 74 flight engineer Chris Williams inspects and configures a spacesuit jetpack, known as the Simplified Aid for EVA Rescue (SAFER), inside the International Space Station’s Destiny laboratory module. The jetpacks attach to the rear of spacesuits and serve as a safety mechanism that allows a spacewalker to maneuver back to the station in the unlikely event they become untethered from their worksite. Credit: NASA/Chris Williams

iss074e0374822 (March 9, 2026) --- NASA astronauts Chris Williams and Jessica Meir, both Expedition 74 flight engineers, inspect and configure a spacesuit jetpack, known as the Simplified Aid for EVA Rescue (SAFER), inside the International Space Station’s Destiny laboratory module. The jetpacks attach to the rear of spacesuits and serve as a safety mechanism that allows a spacewalker to maneuver back to the station in the unlikely event they become untethered from their worksite. Credit: NASA/Chris Williams

iss073e1198126 (Nov. 28, 2025) --- Expedition 73 Flight Engineers Chris Williams and Zena Cardman, both NASA astronauts, seen here with the ISS Ham Radio during a school contact inside the International Space Station's Columbus laboratory module. Cardman was helping new NASA Flight Engineer Chris Williams familiarize himself with station hardware, operations, and systems during his second day aboard the orbital outpost.

iss074e0556775 (May 7, 2026) --- NASA astronaut and Expedition 74 flight engineer Chris Williams speaks to students on the ground using the International Space Station's ham radio. The ARISS, or Amateur Radio on the International Space Station, program gives students around the world the opportunity to talk directly with crew members aboard the orbital outpost, inspiring them to pursue careers in science, technology, engineering, and math. Credit: NASA/Chris Williams

iss074e0000616 (Dec. 16, 2025) --- NASA astronauts Chris Williams and Zena Cardman, both Expedition 74 Flight Engineers, work on spacesuit maintenance inside the International Space Station's Quest airlock.

iss074e0403696 (March 18, 2026) -- NASA astronauts Jessica Meir and Chris Williams are pictured outside the International Space Station during a seven-hour, two-minute spacewalk on March 18, 2026. Credit: NASA/Jack Hathaway

iss074e0402922 (March 18, 2026) -- NASA astronaut Chris Williams smiles at the camera while conducting a spacewalk outside the International Space Station. Credit: NASA/Jessica Meir

jsc2025e045069 (May 14, 2025) --- NASA astronaut Chris Williams (middle) and Roscosmos cosmonaut Sergey Kud-Sverchkov. (right) participate in a training session at the Space Vehicle Mockup Facility at NASA’s Johnson Space Center in Houston, Texas, to prepare for the unlikely event of an emergency during their International Space Station mission.

iss074e0812226 (July 12, 2026) --- NASA astronaut and Expedition 74 flight engineer Chris Williams poses for a portrait while signing his autograph on the wall around the Expedition 74 mission sticker inside the International Space Station’s Quest airlock. Credit: NASA/Chris Williams

NASA astronaut Chris Williams is seen in quarantine, behind glass, during a press conference, Wednesday, Nov. 26, 2025 at the Cosmonaut Hotel in Baikonur, Kazakhstan. Expedition 74 crewmembers: NASA astronaut Chris Williams, Roscosmos cosmonauts Sergey Kud-Sverchkov and Sergei Mikaev, are scheduled to launch aboard their Soyuz MS-28 spacecraft on November 27. Photo Credit: (NASA/Bill Ingalls)

NASA astronaut Chris Williams is seen in quarantine, behind glass, during a press conference, Wednesday, Nov. 26, 2025 at the Cosmonaut Hotel in Baikonur, Kazakhstan. Expedition 74 crewmembers: NASA astronaut Chris Williams, Roscosmos cosmonauts Sergey Kud-Sverchkov and Sergei Mikaev, are scheduled to launch aboard their Soyuz MS-28 spacecraft on November 27. Photo Credit: (NASA/Bill Ingalls)

iss074e0404371 (March 18, 2026) --- NASA astronauts Jessica Meir and Chris Williams, both Expedition 74 flight engineers, are pictured outside the International Space Station during a spacewalk to complete installation of a modification kit ahead of future solar array installation on the 2A power channel of the orbital outpost. It was William’s first spacewalk, Meir's fourth, and the 278th in support of space station maintenance, upgrades, and assembly. Credit: NASA/Jack Hathaway

iss074e0788090 (June 30, 2026) --- NASA astronauts (at center, from left) Jessica Meir and Chris Williams work outside the International Space Station during a seven-hour and 20-minute spacewalk to replace a malfunctioning wrist joint on the Canadarm2 robotic arm. This was the second spacewalk the duo performed together, Meir's fifth, and Williams' second. Credit: NASA

iss074e0788304 (June 30, 2026) --- NASA astronaut and Expedition 74 flight engineer Chris Williams uses a pistol grip tool during a spacewalk to repair the malfunctioning wrist joint on the International Space Station's Canadarm2 robotic arm. Williams, along with NASA astronaut and Expedition 74 flight engineer Jessica Meir (out of frame), spent seven hours and 20 minutes in the vacuum of space during the maintenance spacewalk. Credit: NASA

iss074e0832457 (July 25, 2026) --- NASA astronaut and Expedition 74 flight engineer Chris Williams poses for a portrait inside the International Space Station’s Kibo laboratory module the day before returning to Earth. Williams completed a 241‑day mission aboard the orbital outpost with Roscosmos cosmonauts Sergey Kud‑Sverchkov and Sergei Mikaev (both out of frame), undocking from the station aboard the Soyuz MS‑28 spacecraft and parachuting to a landing in Kazakhstan. Credit: NASA/Anil Menon

iss074e0404896 (March 18, 2026) -- NASA astronauts Chris Williams (left) and Jessica Meir (right) are pictured installing a roll-out solar array modification kit to the International Space Station during a seven-hour, two-minute spacewalk on March 18, 2026. Credit: NASA

iss074e0789722 (June 30, 2026) --- NASA astronaut and Expedition 74 flight engineer Chris Williams playfully flexes for a portrait during a seven‑hour‑and‑20‑minute spacewalk to replace a malfunctioning wrist joint on the International Space Station’s Canadarm2 robotic arm. Credit: NASA/Jessica Meir

iss074e0608854 (May 27, 2026) --- NASA astronaut and Expedition 74 flight engineer Chris Williams shows off the Destiny laboratory module’s Microgravity Science Glovebox aboard the International Space Station. WIlliams was supporting semiconductor crystal research to help advance the commercial space economy and promoting Earth-based industries. Credit: NASA/Chris Williams

NASA astronaut Chris Williams is seen outside the Soyuz MS-28 spacecraft after he landed with Expedition 74 Roscosmos cosmonauts Sergey Kud-Sverchkov, and Sergei Mikaev in a remote area near the town of Zhezkazgan, Kazakhstan on Sunday, July 26, 2026. The trio returned to Earth after logging 241 days in space as a members of Expeditions 73 and 74 aboard the International Space Station. Photo Credit: (NASA/Bill Ingalls)

NASA astronaut Chris Williams is carried to a medical tent shortly after he and Roscosmos cosmonauts Sergey Kud-Sverchkov, and Sergei Mikaev landed in their Soyuz MS-28 spacecraft near the town of Zhezkazgan, Kazakhstan on Sunday, July 26, 2026. The trio returned to Earth after logging 241 days in space as a members of Expeditions 73 and 74 aboard the International Space Station. Photo Credit: (NASA/Bill Ingalls)

NASA astronaut Chris Williams is carried to a medical tent shortly after he and Roscosmos cosmonauts Sergey Kud-Sverchkov, and Sergei Mikaev landed in their Soyuz MS-28 spacecraft near the town of Zhezkazgan, Kazakhstan on Sunday, July 26, 2026. The trio returned to Earth after logging 241 days in space as a members of Expeditions 73 and 74 aboard the International Space Station. Photo Credit: (NASA/Bill Ingalls)

NASA astronaut Chris Williams is carried to a medical tent shortly after he and Roscosmos cosmonauts Sergey Kud-Sverchkov, and Sergei Mikaev landed in their Soyuz MS-28 spacecraft near the town of Zhezkazgan, Kazakhstan on Sunday, July 26, 2026. The trio returned to Earth after logging 241 days in space as a members of Expeditions 73 and 74 aboard the International Space Station. Photo Credit: (NASA/Bill Ingalls)

NASA astronaut Chris Williams is carried to a medical tent shortly after he and Roscosmos cosmonauts Sergey Kud-Sverchkov, and Sergei Mikaev landed in their Soyuz MS-28 spacecraft near the town of Zhezkazgan, Kazakhstan on Sunday, July 26, 2026. The trio returned to Earth after logging 241 days in space as a members of Expeditions 73 and 74 aboard the International Space Station. Photo Credit: (NASA/Bill Ingalls)

iss074e0149044 (Jan. 19, 2026) --- NASA astronaut and Expedition 74 Flight Engineer Chris Williams safely processes samples of a bacterial pathogen inside the Kibo laboratory module’s Life Science Glovebox. Williams was exploring a way to prevent the formation of biofilms, or a layer of microorganisms, anywhere water is found on a spacecraft where they pose human health risks and can damage equipment. The microbe samples are housed inside a specialized cell culture chamber, called a BioCell, and exposed to different levels of ultraviolet light to learn how to inhibit microbial growth and reduce reliance on chemical disinfectants.

iss074e0458223 (April 13, 2026) --- NASA astronauts (from left) Chris Williams and Jack Hathaway, both Expedition 74 flight engineers, pose for a portrait inside the cupola during a break in their procedures as Northrop Grumman's Cygnus XL cargo spacecraft approached the International Space Station. Williams operated the Canadarm2 robotic arm from inside the cupola to capture Cygnus XL, while Hathaway monitored the spacecraft during its approach and rendezvous. Cygnus XL delivered more than 11,000 pounds of new science experiments, lab hardware, and crew supplies for the Expedition 74 crew. Credit: NASA/Jessica Meir

iss074e0335622 (March 1, 2026) --- Weekends on the International Space Station are for housecleaning and haircuts. NASA astronaut Chris Williams trims the hair of fellow NASA astronaut Jack Hathaway, both Expedition 74 flight engineers, using an electric razor attached to a vacuum that collects loose clippings to keep the station’s atmosphere clean in microgravity. Credit: NASA/Chris Williams

iss074e0835533 (July 23, 2026) --- From left, NASA astronaut Chris Williams and Roscosmos cosmonauts Sergey Kud‑Sverchkov and Sergei Mikaev are seated inside the Soyuz MS‑28 spacecraft docked to the International Space Station. The trio practiced and reviewed the landing procedures they would use a few days later, after undocking from the orbital outpost and parachuting to Earth aboard the Soyuz. Credit: NASA/Chris Williams

NASA astronaut Chris Williams, left, and Roscosmos cosmonauts Sergey Kud-Sverchkov, and Sergei Mikaev, right, are seen in quarantine, behind glass, as they arrive at a press conference, Wednesday, Nov. 26, 2025 at the Cosmonaut Hotel in Baikonur, Kazakhstan. Expedition 74 crewmembers: NASA astronaut Chris Williams, Roscosmos cosmonauts Sergey Kud-Sverchkov and Sergei Mikaev, are scheduled to launch aboard their Soyuz MS-28 spacecraft on November 27. Photo Credit: (NASA/Bill Ingalls)

NASA astronaut Chris Williams, left, and Roscosmos cosmonauts Sergey Kud-Sverchkov, and Sergei Mikaev, right, are seen in quarantine, behind glass, at the conclusion of a press conference, Wednesday, Nov. 26, 2025 at the Cosmonaut Hotel in Baikonur, Kazakhstan. Expedition 74 crewmembers: NASA astronaut Chris Williams, Roscosmos cosmonauts Sergey Kud-Sverchkov and Sergei Mikaev, are scheduled to launch aboard their Soyuz MS-28 spacecraft on November 27. Photo Credit: (NASA/Bill Ingalls)

NASA astronaut Chris Williams, left, and Roscosmos cosmonauts Sergey Kud-Sverchkov, and Sergei Mikaev, right, are seen in quarantine, behind glass, at the conclusion of a press conference, Wednesday, Nov. 26, 2025 at the Cosmonaut Hotel in Baikonur, Kazakhstan. Expedition 74 crewmembers: NASA astronaut Chris Williams, Roscosmos cosmonauts Sergey Kud-Sverchkov and Sergei Mikaev, are scheduled to launch aboard their Soyuz MS-28 spacecraft on November 27. Photo Credit: (NASA/Bill Ingalls)

NASA astronaut Chris Williams, left and Roscosmos cosmonaut Sergey Kud-Sverchkov, are seen in quarantine, behind glass, during a press conference, Wednesday, Nov. 26, 2025 at the Cosmonaut Hotel in Baikonur, Kazakhstan. Expedition 74 crewmembers: NASA astronaut Chris Williams, Roscosmos cosmonauts Sergey Kud-Sverchkov and Sergei Mikaev, are scheduled to launch aboard their Soyuz MS-28 spacecraft on November 27. Photo Credit: (NASA/Bill Ingalls)

NASA astronaut Chris Williams, left, and Roscosmos cosmonauts Sergey Kud-Sverchkov, and Sergei Mikaev, right, are seen in quarantine, behind glass, at the conclusion of a press conference, Wednesday, Nov. 26, 2025 at the Cosmonaut Hotel in Baikonur, Kazakhstan. Expedition 74 crewmembers: NASA astronaut Chris Williams, Roscosmos cosmonauts Sergey Kud-Sverchkov and Sergei Mikaev, are scheduled to launch aboard their Soyuz MS-28 spacecraft on November 27. Photo Credit: (NASA/Bill Ingalls)

NASA astronaut Chris Williams, left, and Roscosmos cosmonauts Sergey Kud-Sverchkov, and Sergei Mikaev, right, are seen in quarantine, behind glass, during a press conference, Wednesday, Nov. 26, 2025 at the Cosmonaut Hotel in Baikonur, Kazakhstan. Expedition 74 crewmembers: NASA astronaut Chris Williams, Roscosmos cosmonauts Sergey Kud-Sverchkov and Sergei Mikaev, are scheduled to launch aboard their Soyuz MS-28 spacecraft on November 27. Photo Credit: (NASA/Bill Ingalls)

NASA astronaut Chris Williams, left, and Roscosmos cosmonaut Sergey Kud-Sverchkov are seen in quarantine, behind glass, as they arrive at a press conference, Wednesday, Nov. 26, 2025 at the Cosmonaut Hotel in Baikonur, Kazakhstan. Expedition 74 crewmembers: NASA astronaut Chris Williams, Roscosmos cosmonauts Sergey Kud-Sverchkov and Sergei Mikaev, are scheduled to launch aboard their Soyuz MS-28 spacecraft on November 27. Photo Credit: (NASA/Bill Ingalls)

iss074e0788297 (June 30, 2026) --- NASA astronaut Chris Williams works outside the International Space Station during a seven-hour and 20-minute spacewalk to replace a malfunctioning wrist joint on the Canadarm2 robotic arm. This was Williams' second spacewalk. Credit: NASA

iss074e0788302 (June 30, 2026) --- NASA astronaut Chris Williams works outside the International Space Station during a seven-hour and 20-minute spacewalk to replace a malfunctioning wrist joint on the Canadarm2 robotic arm. This was Williams' second spacewalk. Credit: NASA

NASA astronaut Chris Williams is seen in quarantine, behind glass, during a press conference, Wednesday, Nov. 26, 2025 at the Cosmonaut Hotel in Baikonur, Kazakhstan. Expedition 74 crewmembers: Williams, Roscosmos cosmonauts Sergey Kud-Sverchkov and Sergei Mikaev, are scheduled to launch aboard their Soyuz MS-28 spacecraft on November 27. Photo Credit: (NASA/Bill Ingalls)

NASA astronaut Chris Williams is seen in quarantine, behind glass, during a press conference, Wednesday, Nov. 26, 2025 at the Cosmonaut Hotel in Baikonur, Kazakhstan. Expedition 74 crewmembers: Williams, Roscosmos cosmonauts Sergey Kud-Sverchkov and Sergei Mikaev, are scheduled to launch aboard their Soyuz MS-28 spacecraft on November 27. Photo Credit: (NASA/Bill Ingalls)

NASA astronaut Chris Williams signs a mural at the Cosmonaut Hotel prior to departing for suit-up and launch on a Soyuz rocket with fellow crewmates, Roscosmos cosmonauts Sergey Kud-Sverchkov and Sergei Mikaev, Thursday, Nov. 27, 2025, in Baikonur, Kazakhstan. The launch will send Williams, Kud-Sverchkov and Mikaev, on a mission to the International Space Station. Photo Credit: (NASA/Bill Ingalls)

NASA astronaut Chris Williams puts his hands to the glass of the bus with his children, as he and fellow crewmembers, Roscosmos cosmonauts Sergey Kud-Sverchkov, and Sergei Mikaev, depart the Cosmonaut Hotel to suit-up for their Soyuz launch, Thursday, Nov. 27, 2025, in Baikonur, Kazakhstan. The launch will send Williams, Kud-Sverchkov and Mikaev, on a mission to the International Space Station. Photo Credit: (NASA/Bill Ingalls)

NASA astronaut Chris Williams is helped out of a helicopter by NASA Director for Human Space Flight Programs, Russia, Jay Marschke, left, and Director of Operations, Star City, Russia, John McBrine, at the Karaganda Airport in Kazakhstan after Williams, and Roscosmos cosmonauts Sergey Kud-Sverchkov, and Sergei Mikaev landed in their Soyuz MS-28 spacecraft in a remote area near the town of Zhezkazgan, Kazakhstan on Sunday, July 26, 2026. Williams, Kud-Sverchkov, and Mikaev returned to Earth after logging 241 days in space as a members of Expeditions 73 and 74 aboard the International Space Station. Photo Credit: (NASA/Bill Ingalls)

iss074e0422664 (March 30, 2026) --- NASA astronaut and Expedition 74 flight engineer Chris Williams shows off biology research hardware inside the International Space Station's Kibo laboratory module. The scientific gear supports an investigation that explores using a bioregenerative life-support resource to produce oxygen, regenerate air and water, and provide nutritional supplements on spacecraft during long-term missions farther away from Earth. Credit: NASA/Jack Hathaway

iss074e0316004 (Feb. 18, 2026) --- NASA astronaut and Expedition 74 flight engineer Chris Williams swaps computer components inside scientific hardware in the International Space Station’s Kibo laboratory module. The research gear enables studies of the effects of spaceflight on the molecular and chemical interactions between beneficial microbes and their animal hosts to help preserve astronaut health on long‑duration space missions. Credit: NASA/Jack Hathaway

iss074e0009033 (Jan. 2, 2025) --- NASA astronaut and Expedition 74 crew member Chris Williams smiles for the camera during a spacesuit fit verification inside the International Space Station’s Quest airlock. Officially called the On-Orbit Fit Verification, this procedure confirms that the spacesuit is airtight and properly configured, assesses comfort and mobility, and helps prevent potential safety risks. Credit: NASA/Zena Cardman

iss074e0364697 (March 5, 2026) --- NASA astronaut and Expedition 74 flight engineer Chris Williams familiarizes himself with the hardware he will use to install a modification kit and route cables on the port side of the International Space Station during a spacewalk with fellow NASA astronaut Jessica Meir. The duo will use the hardware to prepare the orbital outpost for a future roll‑out solar array that will be installed during a later spacewalk. Credit: NASA/Jack Hathaway

iss074e0364708 (March 5, 2026) --- NASA astronauts Jessica Meir and Chris Williams, both Expedition 74 flight engineers, familiarize themselves with the hardware they will use to install a modification kit and route cables on the port side of the International Space Station. The duo will conduct a spacewalk using the hardware to prepare the orbital outpost for a future roll‑out solar array that will be installed during a later spacewalk. Credit: NASA/Jack Hathaway

iss073e1228220 (Dec. 2, 2025) --- Expedition 73 Flight Engineers (from left) Chris Williams and Jonny Kim, both NASA astronauts, work together inspecting and cleaning the Enhanced European Exploration Exercise Device (E4D) inside the International Space Station's Columbus laboratory. The E4D is being tested on the orbital outpost for its ability to provide bicycling, rowing, and resistance exercises to protect a crew member’s muscles, bones, and heart health in microgravity.

iss074e0333988 (Feb. 26, 2026) --- Expedition 74 Flight Engineers Jessica Meir and Chris Williams, both NASA astronauts, collect frozen research samples from inside the International Space Station's Destiny laboratory module. The samples were stowed inside science freezers aboard a SpaceX Dragon spacecraft for retrieval and analysis on Earth. Credit: ESA/Sophie Adenot

iss074e0333991 (Feb. 26, 2026) --- Expedition 74 Flight Engineers Jessica Meir and Chris Williams, both NASA astronauts, collect frozen research samples from inside the International Space Station's Destiny laboratory module. The samples were stowed inside science freezers aboard a SpaceX Dragon spacecraft for retrieval and analysis on Earth. Credit: ESA/Sophie Adenot

iss074e0432745 (April 3, 2026) --- NASA astronauts Chris Williams and Jessica Meir, both Expedition 74 flight engineers, pose for a portrait aboard the International Space Station. Meir is wearing a portable breathing apparatus to test its readiness for unlikely emergency scenarios such as an oxygen leak, chemical leak, or fire aboard the orbital outpost. Credit: ESA/Sophie Adenot

iss074e0432750 (April 3, 2026) --- Expedition 74 flight engineers (from left) Chris Williams of NASA, Sophie Adenot of ESA (European Space Agency), and Jessica Meir of NASA pose for a portrait aboard the International Space Station. Meir is wearing a portable breathing apparatus to test its readiness for unlikely emergency scenarios such as an oxygen leak, chemical leak, or fire aboard the orbital outpost. Credit: ESA/Sophie Adenot

iss074e0491074 (April 16, 2026) --- NASA astronaut and Expedition 74 flight engineer Chris Williams configures research hardware inside a portable glovebag for a biotechnology investigation exploring how bacteria affect heart tissue in the microgravity environment. Results from the MVP (Multi-use Variable-g Platform) Cell-09 experiment could lead to advanced methods for preventing or treating heart damage in humans living on and off the Earth. Credit: NASA/Jessica Meir

iss074e0711160 (June 11, 2026) --- NASA astronaut and Expedition 74 flight engineer Chris Williams conducts research operations inside the Kibo laboratory module’s Life Science Glovebox for the Odyssey biotechnology investigation. The microbiology study compares bacteria samples grown onboard the International Space Station to similar samples living in simulated microgravity chambers on Earth to learn how microbes respond to space-like conditions. Insights may lead to new ways of protecting humans and equipment exposed to harsh conditions on and off Earth. Credit: NASA/Jessica Meir

iss074e0319944 (Feb. 21, 2026) --- NASA astronaut and Expedition 74 Flight Engineer Chris Williams processes microbe samples inside the Destiny laboratory module’s Microgravity Science Glovebox aboard the International Space Station. Williams was investigating the use of ultraviolet light as a method to disinfect spacecraft surfaces, inhibit microbial growth, and protect both crew health and space hardware. Credit: ESA/Sophie Adenot

iss074e0316047 (Feb. 18, 2026) --- NASA astronaut and Expedition 74 Flight Engineer Chris Williams calls down to mission controllers during Crew Medical Officer training inside the International Space Station’s Destiny laboratory module. Williams trained to use medical hardware, including an automated external defibrillator, and reviewed procedures such as conducting eye exams and administering medicine. Credit: NASA/Jessica Meir

iss074e0490810 (April 15, 2026) --- Expedition 74 flight engineers Sophie Adenot of ESA (European Space Agency) and Chris Williams of NASA work together inside the International Space Station’s Columbus laboratory module to install and activate new research gear delivered on Northrop Grumman’s second Cygnus XL cargo mission. Williams was configuring the new European Enhanced Exploration Exercise Device, while Adenot was installing advanced biotechnology experiment hardware. Credit: NASA/Jessica Meir

iss074e0503707 (April 22, 2026) --- NASA astronauts Jessica Meir and Chris Williams (in the background) work on separate tasks inside the International Space Station’s Columbus laboratory module. Meir swapped scientific hardware inside the BioLab research incubator to study how DNA damaged by space radiation repairs itself. Williams installed new laptop software and checked computer connections to the station’s Wi‑Fi system. Credit: NASA/Jack Hathaway

iss074e0760514 (June 23, 2026) --- Flight engineer Sophie Adenot of ESA (European Space Agency) assists flight engineer Chris Williams of NASA as he tries on his spacesuit, testing its comfort and mobility as well as its communications and life support systems inside the International Space Station’s Quest airlock. Williams was preparing for a spacewalk to replace a malfunctioning wrist joint on the Canadarm2 robotic arm, planned for June 30, 2026. Credit: NASA

iss074e0760516 (June 23, 2026) --- Flight engineer Sophie Adenot of ESA (European Space Agency) assists flight engineer Chris Williams of NASA as he tries on his spacesuit, testing its comfort and mobility as well as its communications and life support systems inside the International Space Station’s Quest airlock. Williams was preparing for a spacewalk to replace a malfunctioning wrist joint on the Canadarm2 robotic arm, planned for June 30, 2026. Credit: NASA

iss074e0777356 (June 29, 2026) --- NASA astronauts Jessica Meir and Chris Williams, both Expedition 74 flight engineers, pose with their spacesuits inside the International Space Station's Quest airlock. The following day, Meir and Williams wore the suits and exited Quest to conduct a seven-hour-and-20-minute spacewalk and replace a malfunctioning wrist joint on the Canadarm2 robotic arm. Credit: NASA/Jessica Meir

iss074e0777341 (June 29, 2026) --- NASA astronauts Jessica Meir and Chris Williams, both Expedition 74 flight engineers, pose for a portrait inside the International Space Station's Quest airlock while preparing their spacesuits. The following day, Meir and Williams wore the suits and exited Quest to conduct a seven-hour-and-20-minute spacewalk and replace a malfunctioning wrist joint on the Canadarm2 robotic arm. Credit: NASA/Jessica Meir

iss074e0777362 (June 29, 2026) --- NASA astronauts Jessica Meir and Chris Williams, both Expedition 74 flight engineers, prepare their spacesuits inside the International Space Station’s Quest airlock. The following day, Meir and Williams wore the suits and exited Quest to conduct a seven‑hour‑and‑20‑minute spacewalk to replace a malfunctioning wrist joint on the Canadarm2 robotic arm. Credit: NASA/Jessica Meir

iss074e0792349 (June 7 ,2026) --- NASA astronaut and Expedition 74 flight engineer Chris Williams jogs while strapped to the treadmill inside the International Space Station's Tranquility module. The treadmill, formally known as COLBERT (Combined Operational Load-Bearing External Resistance Treadmill), is specifically designed to enable jogging and maintain cardiovascular health in microgravity. Williams is wearing a heart-rate monitor that uses Bluetooth to transmit his cardiac data to a computer tablet for analysis by doctors on Earth. Credit: NASA

iss074e0364911 (March 6, 2026) --- NASA astronaut and Expedition 74 flight engineer Chris Williams pedals on the exercise cycle inside the International Space Station’s Destiny laboratory module. Astronauts work out daily on the exercise cycle to maintain muscle, bone, and cardiovascular health in microgravity. Credit: NASA/Jack Hathaway

iss074e0692827 (June 10, 2026) --- NASA astronaut and Expedition 74 flight engineer Chris Williams swaps hard drives inside the Advanced Space Experiment Processor-4, a research device that supports the processing of scientific samples, increasing the International Space Station's capacity for microgravity research. Credit: NASA/Jessica Meir

NASA astronaut Chris Williams, left, Roscosmos cosmonauts Sergey Kud-Sverchkov, and Sergei Mikaev, right, depart the Cosmonaut Hotel to suit-up for their Soyuz launch, Thursday, Nov. 27, 2025, in Baikonur, Kazakhstan. The launch will send Williams, Kud-Sverchkov and Mikaev, on a mission to the International Space Station. Photo Credit: (NASA/Bill Ingalls)

Expedition 74 crewmembers: NASA astronaut Chris Williams, left, Roscosmos cosmonauts Sergey Kud-Sverchkov and Sergei Mikaev, right, are seen during the State Commission meeting to approve the Soyuz launch of Expedition 74 to the International Space Station, Wednesday, Nov. 26, 2025 at the Cosmonaut Hotel in Baikonur, Kazakhstan. Williams, Kud-Sverchkov and Mikaev, are scheduled to launch aboard their Soyuz MS-28 spacecraft on November 27. Photo Credit: (NASA/Bill Ingalls)

Roscosmos cosmonauts Sergei Mikaev, left, Sergey Kud-Sverchkov, and NASA astronaut Chris Williams, right, wave farewell as they depart the Cosmonaut Hotel to suit-up for their Soyuz launch, Thursday, Nov. 27, 2025, in Baikonur, Kazakhstan. The launch will send Williams, Kud-Sverchkov and Mikaev, on a mission to the International Space Station. Photo Credit: (NASA/Bill Ingalls)

NASA astronaut Chris Williams, left, Roscosmos cosmonauts Sergei Mikaev, and Sergey Kud-Sverchkov, right, depart the Cosmonaut Hotel to suit-up for their Soyuz launch, Thursday, Nov. 27, 2025, in Baikonur, Kazakhstan. The launch will send Williams, Kud-Sverchkov and Mikaev, on a mission to the International Space Station. Photo Credit: (NASA/Victor Zelentsov)

NASA astronaut Chris Williams, left, Roscosmos cosmonauts Sergei Mikaev, and Sergey Kud-Sverchkov, right, depart the Cosmonaut Hotel to suit-up for their Soyuz launch, Thursday, Nov. 27, 2025, in Baikonur, Kazakhstan. The launch will send Williams, Kud-Sverchkov and Mikaev, on a mission to the International Space Station. Photo Credit: (NASA/Bill Ingalls)

NASA astronaut Chris Williams is helped into his Russian Sokol suit as he and fellow crewmates, Roscosmos cosmonauts Sergei Mikaev, and Sergey Kud-Sverchkov, prepare for their Soyuz launch to the International Space Station Thursday, Nov. 27, 2025 in Baikonur, Kazakhstan. Photo Credit: (NASA/GCTC/Pavel Shvets)

NASA astronaut Chris Williams waits to have his Russian Sokol suit pressure checked ahead of his launch on the Soyuz Rocket to the International Space Station with fellow crewmembers, Roscosmos cosmonauts Sergey Kud-Sverchkov, and Sergei Mikaev, Thursday, Nov. 27, 2025 in Baikonur, Kazakhstan. Photo Credit: (NASA/Bill Ingalls)

NASA astronaut Chris Williams has his Russian Sokol suit pressure checked as he and Roscosmos cosmonauts Sergey Kud-Sverchkov, and Sergei Mikaev, prepare to launch in the Soyuz rocket to the International Space Station Thursday, Nov. 27, 2025 in Baikonur, Kazakhstan. Photo Credit: (NASA/Bill Ingalls)

NASA astronaut Chris Williams has his Russian Sokol suit pressure checked as he and Roscosmos cosmonauts Sergey Kud-Sverchkov, and Sergei Mikaev, prepare to launch in the Soyuz rocket to the International Space Station Thursday, Nov. 27, 2025 in Baikonur, Kazakhstan. Photo Credit: (NASA/Bill Ingalls)