Heidemarie Stefanyshyn-Piper

Stefanyshyn-Piper has received numerous honors and awards, such as the Meritorious Service Medal, two Navy Commendation Medals, and two Navy Achievement Medals. She has flown on two Space Shuttle missions, STS-115 and STS-126, during which she completed five spacewalks totaling 33 hours and 42 minutes. As of 2020, she ranks 39th on the all-time list of space walkers by duration.

Stefanyshyn-Piper was born in St. Paul, Minnesota, United States, of Ukrainian-American heritage. Her father, Michael (Mykhailo) Stefanyshyn, now deceased, was born in Polish-governed Halychyna (today in Ukraine), and sent to work in Germany during World War II. After the end of the war, he married a German woman and they both immigrated to the U.S. Stefanyshyn-Piper's mother, Adelheid Stefanyshyn, lived in St. Paul until her death in 2018. Stefanyshyn-Piper was raised in the Ukrainian cultural community of Minneapolis–Saint Paul, is a member of Plast – a Ukrainian scouting organization, and speaks Ukrainian.

Fellow astronaut Steven Lindsey, Chief of the Astronaut Office at the Johnson Space Center in Houston, stated on her retirement: "Heide has been an outstanding astronaut, contributing significantly to the Space Shuttle and Space Station programs. In particular, her superb leadership as lead spacewalker during the STS-126 mission resulted in restoring full power generation capability to the International Space Station. We wish her the best of luck back in the Navy – she will be missed." She was awarded two NASA Space Flight Medals, and the NASA Exceptional Service Medal.

Stefanyshyn-Piper was commander of the 12th expedition of NASA Extreme Environment Mission Operations (NEEMO), a NASA program for studying human survival in the Aquarius underwater laboratory in preparation for future space exploration.

On May 20, 2011 Captain Stefanyshyn-Piper became commander of the Carderock Division of the Naval Surface Warfare Center in Maryland. In July 2013, Captain Stefanyshyn-Piper assumed command of Southwest Regional Maintenance Center in San Diego, California, responsible for all non-nuclear ship maintenance in the San Diego area. She retired from the U.S. Navy after 30 years of active duty service on July 1, 2015.

In July 2009, Stefanyshyn-Piper retired from NASA's Astronaut Corps to return to her Navy duties.

In August 2009, Stefanyshyn-Piper reported to the Naval Sea Systems Command as the Chief Technology Officer.

Stefanyshyn-Piper flew as a Mission Specialist on STS-126, aboard Space Shuttle Endeavour (launched November 14, 2008, and returned November 30), during which she participated in and was Lead Spacewalker on three of four spacewalks. The mission ended when Endeavour landed successfully at Edwards Air Force Base, California. Following Stefanyshyn-Piper's third spacewalk during STS-126, her fifth overall, her total time in EVA became 33 hours, 42 minutes, putting her in twenty-fifth place for total time in EVA.

During the first EVA of STS-126 on November 18, 2008, as Stefanyshyn-Piper was preparing to begin work on the Solar Alpha Rotary Joint, she noticed a significant amount of grease in her tool bag. "I think we had a grease gun explode in the large bag, because there's grease in the bag," Stefanyshyn-Piper reported to Kimbrough, who was working inside the shuttle to help coordinate the EVA. Mission Control managers instructed Stefanyshyn-Piper to clean up the grease using a dry wipe, and while she was doing the cleanup, she accidentally pushed aside the bag. "I guess one of my crew lock bags was not transferred and it's loose," Stefanyshyn-Piper told Kimbrough. The bag floated aft and starboard of the station, and did not pose a risk to the station or orbiter. The bag and its contents entered Low Earth Orbit as space debris, where it eventually burned-up as it entered the Earth's atmosphere west of Mexico on August 3, 2009. When in orbit, it was visible from the ground using a telescope.

Stefanyshyn-Piper flew her first mission on STS-115, aboard Space Shuttle Atlantis (launched September 9, 2006, and returned September 21), as a Mission Specialist and became only the 8th woman to perform a spacewalk (out of 180 total spacewalkers). Stefanyshyn-Piper's participation in two of the mission's three EVAs for a total of 12 hours, 8 minutes made her the second most experienced female spacewalker. She also became the first Minnesota woman to go into space.

Selected as an astronaut candidate by NASA in April 1996, Stefanyshyn-Piper reported to the Johnson Space Center in August 1996. After two years of training and evaluation, she qualified for flight assignment as a mission specialist. Initially assigned to astronaut support duties for launch and landing, she has also served as lead Astronaut Office Representative for Payloads and in the Astronaut Office EVA branch.

Stefanyshyn-Piper received her commission from the Naval ROTC Program at MIT in June 1985. She completed training at the Naval Diving and Salvage Training Center in Panama City, Florida as a Navy Basic Diving Officer and Salvage Officer. During her Salvage tour, she participated in the de-stranding of the tanker Exxon Houston off the coast of Barbers Point in Hawaii. Stefanyshyn-Piper is currently a Captain in the United States Navy.

Stefanyshyn-Piper graduated in 1980 from what was then the all-girls Derham Hall High School in St. Paul, and holds Bachelor of Science (1984) and Master of Science (1985) degrees in mechanical engineering from the Massachusetts Institute of Technology (MIT). She is a licensed ham radio operator with Technician License KD5TVR.

Heidemarie Martha Stefanyshyn-Piper (born February 7, 1963) is an American Naval officer and former NASA astronaut. She has achieved the rank of Captain in the United States Navy. She is also a qualified and experienced salvage officer. Her major salvage projects include de-stranding the tanker Exxon Houston off the coast of Barbers Point, on the island of Oahu, Hawaii, and developing the plan for the Peruvian Navy salvage of the Peruvian submarine Pacocha.