Norman Earl Thagard (born July 3, 1943), (Capt, USMC, Ret.), is an American scientist and former U.S. Marine Corps officer and naval aviator and NASA astronaut. He is the first American to ride to space on board a Russian vehicle, and can be considered the first American cosmonaut. He did this on March 14, 1995 in the Soyuz TM-21 spacecraft for the Russian Mir-18 mission.