Birthname: Sellers; bachelor of science in chemistry from Missouri Southern State College-Joplin, 1980; master of science in chemistry from the University of Missouri-Rolla, 1982; Ph.D. in analytical chemistry from the University of Washington-Seattle, 1990; engineer at Boeing Aerospace Group; hobbies: Camping, horseback riding, windsurfing, snow skiing, flying, scuba diving, piano; was since 2005 Deputy Chief, Astronaut Office, Johnson Space Center; since 2008 Deputy Director, Flight Crew Operations, Johnson Space Center.