
Leo John Genn (9 August 1905 – 26 January 1978) was an English actor and barrister. Signified by his relaxed charm and smooth, "black velvet" voice, he had a lengthy career in theatre, film, television, and radio; often playing aristocratic or gentlemanly, sophisticate roles.
Born to a Jewish family in London, Genn was educated as a lawyer and was a practicing barrister until after World War II, in which he served in the Royal Artillery as a Lieutenant-Colonel. He began his acting career at The Old Vic and made his film debut in 1935, starring in a total of 85 screen roles until his death in 1978. For his portrayal of Petronius in the 1951 Hollywood epic Quo Vadis, he received an Oscar nomination for Best Supporting Actor.
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The Longest Day
1962 · as Brig. Gen. Edwin P. Parker Jr.

Moby Dick
1956 · as Starbuck

Quo Vadis
1951 · as Petronius

55 Days at Peking
1963 · as Gen. Jung-Lu

Ten Little Indians
1965 · as General Mandrake

Khartoum
1966 · as Narrator (voice)

Caesar and Cleopatra
1945 · as Bel Affris

24 Hours of a Woman's Life
1952 · as Robert Sterling

The MacKintosh Man
1973 · as Rollins (uncredited)

The Snake Pit
1948 · as Mark Kik

Endless Night
1972 · as Psychiatrist (uncredited)

The Bloody Judge
1970 · as Lord Wessex

Lady Chatterley's Lover
1955 · as Sir Clifford Chatterley

Circus of Fear
1966 · as Elliott

The Velvet Touch
1948 · as Michael Morrell

The Way Ahead
1944 · as Captain Edwards

Henry V
1944 · as The Constable of France

A Lizard in a Woman's Skin
1971 · as Edmond Brighton