David Wolf (astronaut)

David Wolf is an American retired astronaut, medical doctor and electrical engineer. Born in Indianapolis in 1956, he studied electrical engineering at Purdue University and earned a medical degree from the Indiana University School of Medicine in 1982. He joined the staff of Johnson Space Center in 1983 to study the physiological effects of microgravity, and NASA selected him as an astronaut candidate in 1990. He flew four times, starting with STS-58 as a mission specialist in 1993 and ending with STS-127 in 2009, and spent 128 days on the Russian space station Mir in 1997 and 1998. He logged more than 4,040 hours in space and took part in seven spacewalks totalling 41 hours and 17 minutes. He retired from NASA in December 2012.