David Wolf (astronaut)

David Alexander Wolf (born August 23, 1956) is an American astronaut, medical doctor and electrical engineer. 
Wolf has been to space four times. Three of his spaceflights were short-duration Space Shuttle missions. In total Wolf has logged more than 4,040 hours in space. He is also a veteran of 7 spacewalks totaling 41hrs 17min in both Russian and American spacesuits.