Became interested in acting in the first grade, when he was handpicked to play Winnie the Pooh. Received a scholarship to study acting at the University of Missouri.

Hamm made his professional acting debut in 2000 with a guest appearance on The Hughleys.

Long-term partner is Jennifer Westfeldt, the actress and co-writer of Kissing Jessica Stein (2001). They live in Los Angeles.

His mother died when he was 10; his father followed 10 years later.

Role models are Jeff Bridges, Sam Elliot and Greg Kinnear.

Is an avid golfer, as well as a big football fan.

Worked as a day care teacher during college, and before moving to Hollywood, was a high school teacher.

Received a scholarship to study acting at the University of Missouri.

Went to high school (John Burroughs School in St. Louis) with Sarah Clarke.

Became interested in acting in the first grade, when he was handpicked to play Winnie the Pooh.