Filmography63 titles
| Year | Title | Character | Age at release |
|---|---|---|---|
| 2015 | Chicago MedSeries | Edward Hall | 75 |
| 2013 | One Small HitchMovie | Max Shiffman | 73 |
| 2011 | BossSeries | Gerald 'Babe' McGantry | 71 |
| 2010 | The DefendersSeries | Carmine | 70 |
| 2009 | NCIS: Los AngelesSeries | Garrison | 69 |
| 2005 | Grey's AnatomySeries | Barry Patmore | 65 |
| 2005 | Criminal MindsSeries | Lee Mullens | 65 |
| 2005 | Prison BreakSeries | Richard Mills | 65 |
| 2002 | NBC 75th Anniversary SpecialMovie | Self | 62 |
| 1996 | To Sir, with Love IIMovie | Horace Weaver | 56 |
| 1995 | The Outer LimitsSeries | Chairman Thornwell | 55 |
| 1995 | Just CauseMovie | Warden | 55 |
| 1995 | Siao YuMovie | Mario Moretti | 55 |
| 1995 | The Wasp WomanMovie | Dr. Zinthrop | 55 |
| 1994 | My Name Is KateMovie | Hal Bannister | 54 |
| 1992 | MegavilleMovie | Duprell | 52 |
| 1991 | TaggetMovie | John Tagget | 51 |
| 1989 | Fellow TravellerMovie | Jerry Leavy | 49 |
| 1989 | Making a Case for MurderMovie | Joe Hynes | 49 |
| 1988 | Midnight CrossingMovie | Morely Barton | 48 |
| 1988 | I Never Sang for My FatherMovie | Gene Garrison | 48 |
| 1986 | Adam: His Song ContinuesMovie | John Walsh | 46 |
| 1985 | Screen TwoSeries | Jerry Leavy | 45 |
| 1984 | AuroraMovie | David Ackermann | 44 |
| 1983 | AdamMovie | John Walsh | 43 |
| 1983 | A Case of LibelMovie | Boyd Bendix | 43 |
| 1982 | NewhartSeries | Daniel J. Travanti | 42 |
| 1982 | Night of 100 StarsMovie | Self | 42 |
| 1981 | Hill Street BluesSeries | Frank Furillo | 41 |
| 1980 | It's My TurnMovie | Interviewer (uncredited) | 40 |
| 1979 | Knots LandingSeries | Lieutenant Steinmetz | 39 |
| 1979 | Hart to HartSeries | Edgar | 39 |
| 1977 | CHiPsSeries | Daniel J. Travanti (uncredited) | 37 |
| 1976 | Battle of the Network StarsSeries | — | 36 |
| 1976 | St. IvesMovie | Johnny Parisi | 36 |
| 1975 | Saturday Night LiveSeries | Self - Host | 35 |
| 1973 | KojakSeries | Captain Badaduchi | 33 |
| 1973 | Barnaby JonesSeries | Lon Stevens | 33 |
| 1972 | The Bob Newhart ShowSeries | Mr. Gianelli | 32 |
| 1971 | CannonSeries | — | 31 |
| 1971 | The OrganizationMovie | Sgt. Chassman | 31 |
| 1970 | The Sixth ColumnMovie | Ted | 30 |
| 1969 | Medical CenterSeries | Dr. Pete Fredericks | 29 |
| 1968 | The Mod SquadSeries | — | 28 |
| 1968 | LancerSeries | — | 28 |
| 1967 | Judd, for the DefenseSeries | — | 27 |
| 1967 | MannixSeries | — | 27 |
| 1967 | The Second Hundred YearsSeries | Sears | 27 |
| 1967 | Captain NiceSeries | Lenny | 27 |
| 1966 | Mission: ImpossibleSeries | — | 26 |
| 1966 | Love on a RooftopSeries | — | 26 |
| 1965 | GidgetSeries | — | 25 |
| 1965 | Lost in SpaceSeries | Space Hippie | 25 |
| 1965 | The F.B.I.Series | Prof. Jason Grant | 25 |
| 1965 | Who Killed Teddy Bear?Movie | Carlo | 25 |
| 1964 | The Man from U.N.C.L.E.Series | Luca | 24 |
| 1964 | FlipperSeries | Commander Willard | 24 |
| 1963 | The Patty Duke ShowSeries | — | 23 |
| 1961 | The DefendersSeries | Detective Russo | 21 |
| 1960 | Route 66Series | Marty Johnson | 20 |
| 1958 | Little Moon of AlbanMovie | British Soldier | 18 |
| 1957 | Perry MasonSeries | Barney Austin | 17 |
| 1955 | GunsmokeSeries | Aaron Barker | 15 |