In 1967, he created the role of Dr. Schoenfeld in Bruce Jay Friedman's off-Broadway play Scuba Duba.
He was cast as a standby for Charles Nelson Reilly in Neil Simon's God's Favorite, produced on Broadway in 1974.
[1] In 1976, he co-starred on The Nancy Walker Show as Terry Folson, the first gay principal character on American television.
Other series included: Mary Hartman, Mary Hartman; One Day at a Time; Happy Days; Charlie's Angels; Eight Is Enough; Gimme a Break; Three's Company; Diff'rent Strokes; The Jeffersons; Murder, She Wrote; Trapper John, M.D.
[1] Ken Olfson died of a heart attack on December 31, 1997 in Los Angeles after a two-month illness.