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STS-83 Payload Specialist Gregory T. Linteris gives a thumbs-up as he is assisted into his launch/entry suit in the Operations and Checkout (O&C) Building. 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 experiments. 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 shortly depart the O&C and head for Launch Pad 39A, where the Space Shuttle Columbia will lift off during a launch window that opens at 2:00 p.m. EST, April 4