Jack Grinnage

Jack Grinnage, born Jack Eugene Stewart on January 20, 1931, in Los Angeles, is an American actor whose career in film and television spans seven decades. He made his first television appearances in 1954 before transitioning to film work the following year.

Grinnage's earliest screen credit came in 1955 with Rebel Without a Cause, in which he portrayed Moose, one of three teenage rebels who pursue James Dean's character. He went on to appear in King Creole (1958) alongside Elvis Presley, taking on a pivotal role as a mute gang member. His film work continued with Spartacus (1960) and The Private Navy of Sgt. O'Farrell (1968). On television, he appeared in the Twilight Zone episode "The Mind and the Matter," playing a wayward but sympathetic boy.

In 1961, Grinnage brought his talents to the Broadway stage, joining the cast of the revue The Billy Barnes People. The production marked his sole Broadway credit.

His television career extended well beyond his early work. From 1974 to 1975, he held a supporting role as Ron Updyke, a reporter for the Independent News Service, in the mystery series Kolchak: The Night Stalker. In 2009, he appeared in two eighth-season episodes of Scrubs — "My Jerks" and "My Happy Place" — as Marvell, a replacement janitor. His most recent screen credit is the television series The Kids Are Alright, which premiered in 2018.