Hustle
1975 · Man in Phone Booth
The Don Is Dead
1973 · Don Aggimio Bernardo
Banacek
1972 · Series · Lester Sawyer
Man on a String
1972 · Carlo Buglione (as John Duke Russo)
Maybe I'll Come Home in the Spring
1971 · Doctor (uncredited)
The Greatest Mother of 'em All
1969 · Gene Frazer
Hawaii Five-O
1968 · Series · Abilleno / Willy Vance / Albert Jovanko / Eddie Rizzo
The Split
1968 · Maccione (uncredited)
Mannix
1967 · Series · Lou DeMorro
The Invaders
1967 · Series · Lt. Alvarado
Star Trek
1966 · Series · Lieutenant Commander Giotto / Commodore Wesley
Mission: Impossible
1966 · Series · Tiso Kastner / Cabot
Get Smart
1965 · Series · Green Meadows
The Fugitive
1963 · Series · Sergeant Endicot / Bus Driver
The Outer Limits
1963 · Series · Dr. Terrell
Follow That Dream
1962 · Al (as John Duke)
The Crimebusters
1961 · Hood
