Born in Los Angeles, Grinnage made his first television appearances in 1954.
[1] Grinnage continued to play supporting roles or bit parts in films like King Creole (1958) with Elvis Presley (in a crucial role as a mute gang member), Spartacus (1960) and The Private Navy of Sgt.
He also played an errant but sympathetic boy in the Twilight Zone episode “The Mind and the Matter”.
[2] Between 1974 and 1975, he had a supporting role as Independent News Service reporter Ron Updyke[3] in the mystery series Kolchak: The Night Stalker.
[4] In 2009, Grinnage played the role of Marvell, the replacement janitor, in two episodes of Scrubs.