US astronaut. He was one of the seven-person crew that conducted microgravity research aboard the space shuttle Columbia during a 16-day flight in April–May 1998. He was also in the crew on Atlantis that prepared the International Space Station in February 2000 for the first resident crew, and flew on Columbia in 2002. He was selected as an astronaut in 1994 and logged more than 38 days in space. He is now chief of the Shuttle Branch for the Astronaut Office.
Subjects: Astronomy and Astrophysics.