Diem played for the Colts from 2001 to 2011 and was part of the Super Bowl XLI championship team that beat the Chicago Bears.

Born in Roselle, Illinois, Diem graduated from Glenbard North High School of nearby Carol Stream in 1997.

An all-state selection in track, Diem set state records in both indoor and outdoor shot put as a senior.

[1] At Northern Illinois University, Diem played for the Huskies football team for four seasons from 1997 to 2000 and majored in mechanical engineering.

Diem is a member of the board of directors of ClearObject (formerly CloudOne) – a Fishers, Indiana-based provider of Internet of Things solutions.