He played professionally both indoors and out, including four seasons in Major League Soccer and was an assistant coach for D.C. United.
[2] While still in high school, Kelderman was selected for the U.S. U-16 national team which played in the 1985 FIFA U-16 World Championship.
Kelderman then attended the University of Virginia where he played on the men's soccer team from 1987 to 1990.
On February 7, 1996, D.C. United selected Kelderman in the 8th round (80th overall) in the 1996 MLS Inaugural Player Draft.
On November 6, 1997, the Miami Fusion selected Kelderman with the sixth pick in the 1997 MLS Expansion Draft.
In May 2011, he was named the head coach of the Green Bay Phoenix men's soccer team.
[8] In May 2012, he was named the head coach of the Milwaukee Panther men's soccer team after serving one year at UW-Green Bay.