Filmography22 titles
| Year | Title | Character | Age at release |
|---|---|---|---|
| 1975 | HustleMovie | Man in Phone Booth | 50 |
| 1972 | BanacekSeries | Lester Sawyer | 47 |
| 1971 | Maybe I'll Come Home in the SpringMovie | Doctor (uncredited) | 46 |
| 1969 | The Greatest Mother of 'em AllMovie | Gene Frazer | 44 |
| 1968 | Hawaii Five-OSeries | Willy Vance | 43 |
| 1968 | The SplitMovie | Maccione (uncredited) | 43 |
| 1967 | MannixSeries | Lou DeMorro | 42 |
| 1967 | The InvadersSeries | Lt. Alvarado | 42 |
| 1966 | Mission: ImpossibleSeries | Tiso Kastner | 41 |
| 1966 | Star TrekSeries | Commodore Wesley | 41 |
| 1965 | Get SmartSeries | Green Meadows | 40 |
| 1963 | The FugitiveSeries | Bus Driver | 38 |
| 1963 | The Outer LimitsSeries | Dr. Terrell | 38 |
| 1962 | Follow That DreamMovie | Al (as John Duke) | 37 |
| 1961 | The CrimebustersMovie | Hood | 36 |
| 1960 | The Case of the Dangerous RobinSeries | Teddy Thomas | 35 |
| 1960 | Pay or Die!Movie | Lupo Miano (as John Duke) | 35 |
| 1959 | The UntouchablesSeries | Brikka | 34 |
| 1959 | Hawaiian EyeSeries | Mac | 34 |
| 1959 | Never Steal Anything SmallMovie | Ward (as John Duke) | 34 |
| 1958 | The TexanSeries | Frank | 33 |
| 1957 | Tombstone TerritorySeries | Jim Parker | 32 |