| Series
| Role
| Episode
| Airdate
|
| Airwolf | F.I.R.M. Official | 4x09 - Stavograd (1) | March 20, 1987
|
| Airwolf | William B. Davis | 4x10 - Stavograd (2) | March 27, 1987
|
| Airwolf | | 4x13 - Rogue Warrior | April 24, 1987
|
| Airwolf | F.I.R.M. Official | 4x16 - The Key | May 15, 1987
|
| 21 Jump Street | Mr. Weidlin | 1x12 - Mean Streets and Pastel Houses | June 28, 1987
|
| 21 Jump Street | Mr. Wickenton | 2x17 - Champagne High | March 6, 1988
|
| MacGyver | Judge | 6x20 - Trail of Tears | April 26, 1991
|
| The Commish | Don Chesley | 1x06 - A Matter of Life or Death (2) | November 2, 1991
|
| Nightmare Cafe | Doctor | 1x05 - Sanctuary for a Child | March 27, 1992
|
| The X-Files | Smoking Man | 1x01 - Pilot | September 10, 1993
|
| The X-Files | CIA Agent | 1x16 - Young at Heart | February 11, 1994
|
| The X-Files | Smoking Man | 1x21 - Tooms | April 22, 1994
|
| The X-Files | Smoking Man | 1x24 - The Erlenmeyer Flask | May 13, 1994
|
| The X-Files | Smoking Man | 2x01 - Little Green Men | September 16, 1994
|
| The X-Files | Smoking Man | 2x04 - Sleepless | October 7, 1994
|
| The X-Files | Smoking Man | 2x06 - Ascension (2) | October 21, 1994
|
| The X-Files | The Cigarette Smoking Man | 2x08 - One Breath | November 11, 1994
|
| Sliders | Professor Myman | 1x07 - Eggheads | April 26, 1995
|
| The X-Files | The Cigarette Smoking Man | 2x22 - F. Emasculata | April 28, 1995
|
| The X-Files | The Cigarette Smoking Man | 2x25 - Anasazi (1) | May 19, 1995
|
| The Outer Limits (1995) | Ed | 1x13 - The Conversion | June 9, 1995
|
| The X-Files | The Cigarette Smoking Man | 3x01 - The Blessing Way (2) | September 22, 1995
|
| The X-Files | The Cigarette Smoking Man | 3x02 - Paper Clip (3) | September 29, 1995
|
| The X-Files | Cigarette-Smoking Man | 3x10 - 731 (2) | December 1, 1995
|
| The X-Files | Cigarette-Smoking Man | 3x16 - Apocrypha (2) | February 16, 1996
|
| The X-Files | Cigarette-Smoking Man | 3x21 - Avatar | April 26, 1996
|
| The X-Files | Cigarette-Smoking Man | 3x23 - Wetwired | May 10, 1996
|
| The X-Files | Cigarette-Smoking Man | 3x24 - Talitha Cumi (1) | May 17, 1996
|
| The Outer Limits (1995) | John Wymer | 2x20 - Out of Body | July 14, 1996
|
| The X-Files | Cigarette Smoking Man | 4x01 - Herrenvolk (2) | October 4, 1996
|
| The X-Files | Cigarette Smoking Man | 4x07 - Musings of a Cigarette-Smoking Man | November 17, 1996
|
| The X-Files | Cigarette Smoking Man | 4x08 - Tunguska (1) | November 24, 1996
|
| The X-Files | Cigarette Smoking Man | 4x09 - Terma (2) | December 1, 1996
|
| The X-Files | Cigarette Smoking Man | 4x14 - Memento Mori | February 9, 1997
|
| The X-Files | Cigarette Smoking Man | 4x21 - Zero Sum | April 27, 1997
|
| The X-Files | Cigarette Smoking Man | 5x01 - Redux (2) | November 2, 1997
|
| The X-Files | Cigarette Smoking Man | 5x02 - Redux II (3) | November 9, 1997
|
| The X-Files | Cigarette Smoking Man | 5x14 - The Red and the Black (2) | March 8, 1998
|
| The X-Files | Cigarette Smoking Man | 5x20 - The End | May 17, 1998
|
| The X-Files | Cigarette Smoking Man | 6x01 - The Beginning | November 8, 1998
|
| The X-Files | Cigarette Smoking Man | 6x03 - Triangle | November 22, 1998
|
| The X-Files | Cigarette Smoking Man | 6x11 - Two Fathers (1) | February 7, 1999
|
| The X-Files | Cigarette Smoking Man | 6x12 - One Son (2) | February 14, 1999
|
| The X-Files | Cigarette Smoking Man | 6x22 - Biogenesis (1) | May 16, 1999
|
| The X-Files | Cigarette Smoking Man | 7x02 - The Sixth Extinction II: Amor Fati (3) | November 14, 1999
|
| The X-Files | Cigarette Smoking Man | 7x11 - Closure (2) | February 13, 2000
|
| The X-Files | Cigarette Smoking Man | 7x15 - En Ami | March 19, 2000
|
| The X-Files | Cigarette Smoking Man | 7x22 - Requiem | May 21, 2000
|
| The Outer Limits (1995) | Dr. Biemler | 7x10 - Worlds Within | June 29, 2001
|
| The X-Files | Cigarette Smoking Man | 9x19 - The Truth | May 19, 2002
|
| Smallville | Mayor Tate | 2x08 - Ryan | November 12, 2002
|
| Smallville | Mayor William Tate | 3x06 - Relic | November 5, 2003
|
| Stargate SG-1 | Prior | 9x08 - Babylon | September 9, 2005
|
| Stargate SG-1 | Prior | 9x11 - The Fourth Horseman (2) | January 6, 2006
|
| Human Target (2010) | Whitey Doyle | 1x05 - Run | February 10, 2010
|
