Klostermann was born in Dubuque, Iowa and grew up in Dyersville, Iowa and attended Beckman Catholic High School, where he played fullback and linebacker on the football team and point guard on the basketball team.
[1] He was a co-captain of the football team along with future NFL first round pick Mike Haight.
[2] Klostermann began his collegiate career at Waldorf Junior College before transferring to the University of Iowa as a walk-on.
[4] Klostermann was selected in the eighth round of the 1986 NFL draft by the Denver Broncos.
[9] Klostermann was signed by the Los Angeles Rams on November 28, 1990 to play the rest of the season.