Acting

2024

2 episodes as Dr. Yablonski

2023

1 episode as Professor James Moriarty

2022

1 episode as Vic Wallace

2020

1 episode as Self

2019		Elementary 1 episode as Antoine LaGrange
2019		The Good Fight 1 episode as Professor Harrison

2017

2 episodes as Baldur Magnusson

2015

1 episode as Jacob Skolimski

2010		The Fran Drescher Show 1 episode
2010		The Miraculous Year

2008

1 episode as Dr. Morgan Remus

2006

as Judge

2004

2002

1 episode as Dr. Shafer

2000		The Practice 2 episodes 1 episode as Judge Barton Wolfe
2000		Longhair and Doubledome: Good Wheel Hunting as Longhair (voice)

1999

1 episode as Niles (archive footage)

1997		Remember WENN 1 episode as Desmond Quist
1997		Chicago Hope 2 episodes
1997		Duckman 1 episode

1993

145 episodes as Niles

1992		Murder, She Wrote 1 episode as Neal Dishman
1992		L.A. Law 1 episode as C. Howard Grady
1992		Columbo 1 episode as Alex Varrick

1991		Palomino as Doctor
1991		The Perfect Tribute as Gov. Curtin

1990		Havana as Marion Chigwell
1990		The Hunt for Red October as CPT Charlie Davenport (USS Enterprise)

1989		MacGyver 1 episode as Nicholas Helman
1989		K-9 as Halstead

1988		Star Trek: The Next Generation 2 episodes as Professor James Moriarty
1988		Frank's Place 1 episode as Arnold David Tuney
1988		The Equalizer 1 episode as Eddie Mason

1987		Dynasty 4 episodes
1987		The Spirit as Teasdale

1986		Tall Tales & Legends 1 episode as Congressman
1986		Davy Crockett as Congressman
1986		Matlock 1 episode
1986		George Washington II: The Forging of a Nation 2 episodes as Patrick Henry
1986		Cheers 1 episode as Mr. Reinhardt

1985		The A-Team 1 episode as Phillips
1985		Chain Letters as Steve
1985		Scarecrow and Mrs. King 2 episodes
1985		The Eagle and The Bear as Underhill
1985		Remington Steele 1 episode as Pierre Fumar

1984		Cagney & Lacey 1 episode
1984		Highway to Heaven 1 episode

1980

249 episodes as Eliot Carrington

1974		Great Performances 1 episode as Moulineaux
1974		In Fashion as Moulineaux