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William Sylvester (January 31, 1922 – January 25, 1995) was an American TV and film actor. His most famous film credit was Dr. Heywood Floyd in Stanley Kubrick's 2001 A Space Odyssey (1968). Born in Oakland, California and married at one time to the British actress Veronica Hurst, he moved to England after the Second World War and became a staple of British B films at a time when American and Canadian actors were much in demand in order to give indigenous films some appeal in the US. As a result, he gained top billing in one of his very first films, House of Blackmail (1953), directed by the veteran filmmaker Maurice Elvey, for whom he also made What Every Woman Wants the following year. He also starred in such minor films as The Stranger Came Home (1954, for Hammer), Dublin Nightmare (1958), Offbeat (1960), Information Received (1961), Incident at Midnight, Ring of Spies and Blind Corner (all 1963). There were also lead roles in four British horror films: Gorgo (1960), Devil Doll (1963), Devils of Darkness (1964) and The Hand of Night (1966). Among his many TV credits were a 1959 BBC version of Shakespeare's Julius Caesar (playing Mark Antony), The Saint, The Baron, The High Chaparral, Harry O and The Six Million Dollar Man. His later films included You Only Live Twice (1967) and, back in the USA after his prominent role for Kubrick, Busting (1973), The Hindenburg (1975) and Heaven Can Wait (1978). He died in Sacramento, California in 1995, aged 72.

The 9th Wonder of the World: The Making of 'Gorgo'
as Sam Slade (archive footage)

2001: The Making of a Myth
as Dr. Heywood R. Floyd (archive footage) (uncredited)

Roger Moore: A Matter of Class
as Self (archive footage)

First Family
as TV Commentator Howard

Big Shamus, Little Shamus

Buck Rogers in the 25th Century
as Lt. General Preston Myers

Heaven Can Wait
as Nuclear Reporter

What Really Happened to the Class of '65?

The Hardy Boys / Nancy Drew Mysteries

Quincy, M.E.
as Joe Crawford

Gemini Man
as Leonard Driscoll

Riding with Death
as Leonard Driscoll

The Hindenburg
as Luftwaffe Colonel

Switch
as Ellis

Harry O

Busting
as Mr. Weldman

The Six Million Dollar Man
as Frederick Collins

Don't Be Afraid of the Dark
as Tom Henderson

The Magician
as Peter Hayden

Banacek
as Dr. Stahl

Cannon

San Francisco International Airport
as Colonel Wilkins

The Lawyer
as Paul Harrison

The Challengers
as Brad York

McCloud

Marcus Welby, M.D.
as Paul Berwick

The Syndicate
as Burt Hickey

The Hand of Night
as Paul Carver

Red and Blue
as Trumpeter

2001: A Space Odyssey
as Dr. Heywood Floyd

The High Chaparral
as Jack Simmons

You Only Live Twice
as Pentagon Official (uncredited)

The F.B.I.
as Tom Barber

Green Acres
as Dr. Hoffman

The Troubleshooters
as Al Stevens

Devils of Darkness
as Paul Baxter

Devil Doll
as Mark English

Ring of Spies
as Gordon Lonsdale

Blind Corner
as Paul Gregory

Incident at Midnight
as Vince Warren

The Saint
as Foots Fortunati

Information Received
as Rick Hogan
Drama 61-67
as Mark Lander

Gorgo
as Sam Slade

Offbeat
as Layton / Steve Ross

Danger Man
as James Carpenter / Oscar Schumak

Whirlpool
as Hermann
The Caine Mutiny Court-Martial

Dublin Nightmare
as John Kevin

High Tide at Noon
as Alec Douglas

Armchair Theatre

Portrait of Alison
as Dave Forrester

The Stranger Came Home
as Philip Vickers

What Every Woman Wants
as Jim Barnes

Albert R.N.
as Texas

House of Blackmail
as Jimmy

Appointment in London
as Mac

The Yellow Balloon
as Len Turner

They Were Not Divided
as American Soldier (uncredited)

Give Us This Day
as Giovanni