Umphrey competed in college gymnastics at UCLA, where he was an All-American and two-time team captain. He was a member of the U.S. national team from 1989 to 1997, competing at the World Artistic Gymnastics Championships in 1991, 1994, and 1996. His best result was a 4th-place finish on the horizontal bar in 1994. He also won a gold medal for the team all-around at the 1995 Pan American Games.