Education
Mittendorf attended Lehigh University, playing on the men" soccer team from 1995 to 1998.
Mittendorf attended Lehigh University, playing on the men" soccer team from 1995 to 1998.
He began his collegiate career as a defender and ended it as a high socring forward. His senior season, he led the National Collegiate Athletic Association in goals per game. In 1999, he was named to the Patriot League Men's Soccer All-Decade team
In 1999, the Colorado Rapids selected Mittendorf in the first round (eighth overall) of the 1999 Master of Library Science College Draft.
The Lehigh Valley Steam also selected him in the USL A-League draft. Mittendorf signed with the Rapids who released him on March 29, 1999 during a pre-season roster reduction.
He then joined the Hershey Wildcats of the A-League. In 2000, he played for the Long Island Rough Riders.
In 2001, he played for Värtans IK in Sweden.
In 2002, he returned to the Rough Riders and retired at the end of the season. In 2002, Mittendorf co-founded Coastal Soccer which he sold in 2006.