He was also known for his starring role as Chief Petty Officer Willie Miller on the 1960’s television sitcom The Wackiest Ship in the Army.

His younger sister, Shirley Ann Kellin (born August 14, 1927), died in the 1944 Hartford circus fire.

Kellin made his Broadway debut in 1949 in At War with the Army[1] and repeated his role in the 1950 film version with Dean Martin and Jerry Lewis.

[citation needed] In 1966, Kellin appeared in "The Deadly Games of Gamma 6" episode on Lost in Space as Myko.

Later in 1966, he played “Chad Timpson”, a reformed outlaw protecting his challenged brother, in “Moonstone” (S12E13) on the TV Western series Gunsmoke.