Television • 1967:
Cimarron Strip (episode: "The Roarer") as Arliss Blynn • 1969:
Daniel Boone (episode: "The Traitor") as Lackland • 1969:
Hawaii Five-O (episode: "Up Tight") as Professor David Stone • 1970:
Hawaii Five-O (episode: "Three Dead Cows At Makapu") as Dr. Alexander Kline • 1971:
The Name of the Game (episode: "Beware of the Watchdog") as Lazlo Subich • 1971:
Travis Logan D.A. as Psychiatrist • 1971:
Bearcats! (episode: "The Hostage") as Ben Tillman • 1971:
Goodbye, Raggedy Ann (TV movie) as David Bevin • 1971:
McMillan & Wife (episode: "Husbands, Wives and Killers") as Tom Benton • 1971:
Mission Impossible (episode: "Blues") as Joe Belker • 1972:
Mannix (episode: "A Walk in the Shadows") as Tom Farnom • 1972:
Nichols a.k.a.
James Garner as Nichols (episode: "Fight of the Century") • 1972: ''
Cade's County'' (episode: "The Fake") as Ben Crawford • 1972:
Ironside (episode: "Five days in the Death of Sgt. Brown: Part 1") as Phil McIver • 1972:
The Bold Ones: The New Doctors a.k.a.
The New Doctors (episode: "Five Days in the Death of Sgt Brown: Part II") as Phil McIver • 1972:
M*A*S*H (episode: "
Yankee Doodle Doctor") as Lt Dwayne Bricker • 1972:
Banyon (episode: "Just Once") as Sergeant Randall • 1973:
Kung Fu (episode: "The Salamander") as Alonzo Davis • 1973:
Marcus Welby, M.D. a.k.a.
Robert Young, Family Doctor (episode: "The Comeback") as Magruder • 1974:
Barnaby Jones (episode: "Death on Deposit") as "Doc" Fred Tucker • 1969–1975:
Hawaii Five-O (6 episodes): • 1969 "Up Tight" as David Stone • 1970 "Three Dead Cows at Makapuu" (2-part episode) as Dr Alexander Kline • 1970 "The Guarnerius Caper" as Dmitri Rostov • 1972 "While You're at It, Bring in the Moon" as Byers • 1974 "One Born Every Minute" as Joe Connors • 1975 "And the Horse Jumped Over the Moon" as Bernie Ross • 1975:
The Mary Tyler Moore Show (episode: "Mary's Father") as Father Terrance Brian • 1975:
The Legend of Lizzie Borden as Hosea Knowlton • 1975:
Attack on Terror: The FBI vs. the Ku Klux Klan as Justice Department attorney Ralph Paine • 1976:
Hallmark Hall of Fame (episode: "Truman at Potsdam") as President
Harry S Truman • 1979:
Backstairs at the White House (episodes 1.1, 1.2 and 1.4) as President
Calvin Coolidge • 1979:
Blind Ambition (TV mini-series) as Charles Shaffer • 1979: ''
Salem's Lot a.k.a. Blood Thirst'' as Dr Bill Norton • 1982–1988:
St. Elsewhere - 120 episodes as Dr. Donald Westphall • 1993: ''
Jack's Place'' (episode: "Who Knew?") as Marcus Toback • 1994:
The Road Home (pilot episode) as William Babineaux
Films • 1970:
The Grasshopper or
Passions or
The Passing of Evil as Jack Benton • 1972:
The Trial of the Catonsville Nine as Father
Daniel Berrigan • 1972:
The Snoop Sisters or
The Female Instinct (TV Movie) as Milo Perkins • 1973:
Hunter (TV Movie) as Dr Miles • 1974:
Indict and Convict (TV Movie) as Timothy Fitzgerald • 1974:
Things in Their Season (TV Movie) as Carl Gerlach • 1975:
The Legend of Lizzie Borden (TV Movie) as Hosea Knowlton • 1975:
Attack on Terror: The FBI vs. the Ku Klux Klan (TV Movie) as Ralph Paine • 1975:
A Moon for the Misbegotten (TV Movie) as Phil Hogan • 1976:
Eleanor and Franklin (TV Movie) as Louis Howe • 1976:
The Sad and Lonely Sundays (TV Movie) as Dr Frankman • 1976:
Harry S. Truman: Plain Speaking (TV Movie) as President
Harry S. Truman • 1977:
The Amazing Howard Hughes (TV Movie) as Noah Dietrich • 1977:
MacArthur as President Harry S. Truman • 1977:
Mary White (TV Movie) as William Allen White • 1979: ''
Salem's Lot'' as Dr. Bill Norton • 1980:
The Ninth Configuration or
Twinkle, Twinkle, Killer Kane as Col. Richard Fell • 1981:
Inchon as President Harry S. Truman (voice, uncredited) • 1981:
True Confessions as Dan T. Campion • 1981:
The Pursuit of D.B. Cooper or
Pursuit as Brigadier • 1981:
Skokie or
Once They Marched Through a Thousand Towns (UK title) (TV Movie) as Mayor Albert J. Smith • 1982: ''
Tomorrow's Child'' (TV Movie) as Anders Stenslund • 1983:
Special Bulletin (TV Movie) as John Woodley • 1989:
The Final Days (TV Movie) as
Leonard Garment • 1990:
The Exorcist III as Father Joseph Dyer • 1991:
The Perfect Tribute (TV Movie) as Warren • 1992:
Citizen Cohn (TV Movie) as
Joseph N. Welch • 1993:
Message from Nam as Ed Wilson • 1995:
Bye Bye Love as Walter Sims (final film role) ==Awards and nominations==