Forster is the son of actor Peter Forster and, through his mother, is a great-great-great-grandson of Charles Dickens. He is also the step-son of actor Whit Bissell and step-grandson of actor Alan Napier, who portrayed Alfred the Butler in the Batman television series (1966–1968).
Forster joined The Partridge Family in 1971, replacing Jeremy Gelbwaks, and continued until the show ended in 1974. Chris Partridge was the Drummer of the fictional family band. As of 2002/2003, Forster was a race car driver in Northern California, and continued to act in community theater there.
