Dr. Richard M. Linnehan, a 1985 graduate of The Ohio State University College of Veterinary Medicine, hitched a ride on the space shuttle Endeavour yesterday morning at 2:28am EST.
He is this latest mission's lead spacewalker, having logged hours of time in the vacuum of space on a mission in 2002 to repair the Hubble space telescope.
This mission will mark Dr. Linnehan's final shuttle flight and is his fourth trip into space.
His previous trips include:
> The Life Sciences and Microgravity Spacelab mission aboard the Space Shuttle Columbia in 1996.
> The Neurolab aboard Columbia as operator and test subject, observing the effects of low gravity on the brain and nervous system in 1998.
> and Servicing Mission 3B, where he helped upgrade the Hubble space telescope's systems and walked in space three times in 2002.