David Wolf was born on August 23, 1956, in Indianapolis, Indiana. Wolf graduated with distinction from Purdue University with a degree in electrical engineering. He then earned a medical degree from Indiana University School of Medicine, and trained as a flight surgeon with the United States Air Force. In 1983, Wolf worked at the Johnson Space Center to study the physiological effects of microgravity. Wolf was then assigned as chief engineer for the design of the medical facility of the Space Station. In 1990, Wolf was selected as an astronaut candidate. After training, Wolf was selected as an astronaut, and would go on four space flights–the STS-59, Mir Expedition 24, STS-112, and STS-127. He had a total of 7 EVAs, and spent 168 days in space. After the missions, Wolf worked as the Managing Director for EarthTomorrow, Inc., and was a visiting professor at Purdue University. Currently, he is the Chief Technology Officer for Voxel Systems.