Hamm was named to three Olympic Teams (2000, 2004, and 2008) and helped the U.S. men win the team silver medal at the 2004 Olympic Games. The 200203 U.S. floor exercise champion, Hamm also was a member of the 2003 World Championships Team that claimed the team silver medal.
Hamm and his twin brother, Paul, who was also named to the 2000, 2004, and 2008 Olympic Teams, made history in 2000 when they became the first twins ever to compete in the same Olympic Games in gymnastics. Hamm earned his exercise science degree from Ohio State in 2007. He is the son of Sandy and Cecily Hamm and has an older sister, Elizabeth (Betsy), who was a former member of the USA Gymnastics Senior National Team.
Hamm was coached by 2017 USAG Hall of Fame member Miles Avery.