| Hibakusha | 2012 | Colonel Paul Tibbets (voice) (as William Knight) | Movie |
| Carl Panzram: The Spirit of Hatred and Vengeance | 2011 | Robert Stroud (voice) (as William Knight) | Movie |
| Prince of Swine | 2010 | Bernie (as William Knight) | Movie |
| The League of S.T.E.A.M. | 2010 | Reginald Vanderbeau III | TV Show |
| The Family | 2009 | Papa (as William Knight) | Movie |
| Fear House | 2008 | Arnold Tinski | Movie |
| Exorcist Chronicles | 2007 | Father Kelly | Movie |
| One Long Night | 2007 | Major | Movie |
| Room Service | 2007 | Henry | Short Film |
| Santa Croce | 2007 | Father McGarry | Short Film |
| Naruto: Shippûden | 2007 | Danzô Shimura | TV Show |
| Kôkaku kidôtai: Stand Alone Complex Solid State Society | 2006 | Daisuke Aramaki | TV Movie |
| Ghost in the Shell: Stand Alone Complex | 2006 | Chief Daisuke Aramaki | TV Show |
| IGPX: Immortal Grand Prix | 2005 | Ichi (1 episode, 2005) | TV Show |
| Kôkyô shihen Eureka Sebun | 2005 | Kuzemi (3 episodes, 2005-2006) | TV Show |
| Appleseed | 2004 | Elder (voice) (as William Frederick) | Movie |
| Frog-g-g! | 2004 | Bartlett | Movie |
| Ghost in the Shell 2: Innocence | 2004 | Aramaki | Movie |
| Monster | 2004 | Blind Old Man (1 episode, 2004) | TV Show |
| Paranoia Agent | 2004 | Old Man (unknown episodes) | TV Show |
| Samurai Champloo | 2004 | Daigorô (unknown episodes) | TV Show |
| Exorcism | 2003 | Father Donovan | Movie |
| Texhnolyze | 2003 | Tsujinaka (unknown episodes) | TV Show |
| Gungrave | 2003 | 'Dr. T' Doctor Tokioka, Butler Tokioka | TV Show |
| Ikki tôsen: Dragon Destiny | 2003 | Choko (13 episodes, 2003) | TV Show |
| R.O.D the TV | 2003 | Shop Owner A (unknown episodes) | TV Show |
| Licensed by Royalty | 2003 | Professor Freud, Lord Miralio (unknown episodes) | TV Show |
| Haibane renmei | 2002 | Watchmaker (unknown episodes) | TV Show |
| Naruto | 2002 | Sukeza | TV Show |
| Four Faces of God | 2002 | Father Pecato | Short Film |
| Overman King-Gainer | 2002 | Gach (unknown episodes) | TV Show |
| Kaubôi bibappu: Tengoku no tobira | 2001 | Vandamme (voice: English version) | Movie |
| Metropolis | 2001 | Supt. Notarlin (voice: English version) | Movie |
| Fake | 2000 | Leonard Henry (voice: English version) | Movie |
| NieA under 7 | 2000 | Butcher / ... (1 episode, 2000) | TV Show |
| The Trouble with Normal | 2000 | Alan (1 episode, 2000) | TV Show |
| The Big O | 1999 | Gordon Rosewater | TV Show |
| I Got the Hook Up | 1998 | Agent In Charge | Movie |
| Sex Files: Alien Erotica | 1998 | Col. Parks (as William Fredrick) | Movie |
| Cowboy Bebop | 1998 | Old Man (unknown episodes) | TV Show |
| Outlaw Star | 1998 | Additional Voices (unknown episodes) | TV Show |
| Trigun | 1998 | | TV Show |
| Mezzo forte | 1998 | Emoto (voice: English version) (as William Frederick Knight) | TV Show |
| Quicksilver Highway | 1997 | Rhinoplasty Man | TV Movie |
| Click | 1997 | P (2 episodes, 1997) | TV Show |
| Flight | 1997 | Man | Movie |
| Zarkorr! The Invader | 1996 | Sheriff Rocker | Movie |
| El Hazard: The Magnificent World | 1995 | Dr. Schtalubaugh (voice: English version) (as William Frederick Knight) | TV Show |
| Ghost in the Shell | 1995 | Section 9 Department Chief Aramaki | Movie |
| El Hazard: Wanderers | 1995 | Captain of the Guard (unknown episodes) | TV Show |
| Akira | 1988 | Additional Voices (Animaze version 2001) (voice: English version) (as William Frederick Knight) | Movie |
| Star Trek | 1966 | Amorous Crewman | TV Show |
