Donald Pettit is a chemical engineer and NASA astronaut. Selected by NASA in April 1996, Dr. Pettit reported to the Johnson Space Center in August 1996. A veteran of three spaceflights, Dr. Pettit has logged more than 370 days in space and over 13 EVA (spacewalk) hours in 3 flights. Expedition 6 (November 23, 2002 to May 3, 2003) was his first spaceflight as NASA International Space Station Science Officer. On Expedition 30/31 (December 21, 2011 to July 1, 2012) he created the incredible Star Trails images by compositing a series of images photographed from a mounted camera on the International Space Center. Dr. Pettit earned his Doctorate in Chemical Engineering from the University of Arizona in 1983.