Noted: Clark was one of seven astronauts aboard the Space Shuttle Columbia. She died when the spacecraft disintegrated on re-entry just 16 minutes before it was due to land in Florida on Feb. 1, 2003. Clark was 41.
Clark grew up in Racine, graduating from Horlick High School in 1979 before heading to Madison, where she earned a bachelor’s degree in zoology in 1983 at the University of Wisconsin and a doctorate in medicine in 1987.