Known best for his starring role in the CBS Western series Dundee and the Culhane, Garrison also appeared in episodes of Cheyenne, Sugarfoot, and The Adventures of Ozzie & Harriet.
He made his first television appearance in a 1957 episode of ABC's Colt .45.
His 1950s and 1960s film credits include roles in Onionhead, Up Periscope, and Splendor in the Grass.
He grew up in New York City as a member of an Irish-American family.
He appeared with Barbara Stanwyck in a 1965 episode of The Big Valley.