Payload Specialist Gregory T. Linteris prepares to enter the Space Shuttle Columbia at Launch Pad 39A in preparation for launch.

STS-94 Payload Specialist Gregory T. Linteris prepares to enter the Space Shuttle Columbia at Launch Pad 39A in preparation for launch. He holds a doctorate in mechanical and aerospace engineering. Linteris has worked at the National Institute of Standards and Technology and is the Principal Investigator on a NASA microgravity combustion experiment. As a member of the Red team, Linteris will concentrate on three combustion experiments. Two of these experiments are housed in the Combustion Module. He will also be backing up crew members on the other Microgravity Science Laboratory-1 (MSL-1) investigations. He and six fellow crew members will lift off during a launch window that opens at 1:50 p.m. EDT, July 1. The launch window will open 47 minutes early to improve the opportunity to lift off before Florida summer rain showers reach the space center