Actor, Film Producer, and Screenwriter. He was a handsome and versatile leading actor who is best known for playing the character roles of uncles, Englishmen, Squadron Leaders, princes, captains, judges, colonels, club members, detectives, navigators, fugitives political figures, men of distinction with titles such as Sir or Honour, and historical figures including Benjamin Disraeli (1804-1881), usually in films made by Alfred Hitchcock and Alexander Korda's Denham Studios in London, England. He will be best remembered for playing the role of 'George Grant' in the crime mystery thriller film drama, "Sleeping Car To Trieste" (1948). The film which was directed by John Paddy Carstairs, which was written for the screen by Allan McKinnon, Clifford Grey, and William Douglas-Home, and which also starred Jean Kent, Albert Lieven, Paul Dupuis, David Tomlinson, Finlay Currie, and Rona Anderson, tells the story of spies who are pursuing a stolen diary aboard the Orient Express. He will also be remembered for playing the role of 'Clive Errington' in the episode entitled, "The Desperate Diplomat," of the classic crime mystery television series, "Ghost Squad," which originally aired on May 18, 1963, and which also starred Michael Quinn, Anthony Marlowe, and Claire Nielson, is the story of while working undercover as a butler to a foreign diplomat. GS agent Tony Miller discovers that the man is being blackmailed by an unscrupulous foreigner, who threatened to make known the man's gambling debts. He was born of Irish and French ancestry one of three children as Derrick Raoul Edouard Alfred De Marney to Edward Arthur Toreau De Marney (1873-1942), and his wife Eileen Violet Concanen De Marney (1874-1959), in London, England, on September 21, 1906. He was also the grandson of the noted Victorian lithographer Alfred Concanen (1835-1886). He began his acting career in repertory theater on the stage in his native England in 1922. He also appeared in several stage productions of such plays as, 'Frank Burroughs,' and 'M Baptiste,' in "Romance" (October 27, 1926, to February 19, 1927), "Young Woodley" (1927-1928), as 'Norwegian,' and 'Wharfman,' in "Maya" (January 27, 1928-), 'Charlie Stubbs' in "Belle," or "What's The Bother" (October 1929-), "Candida (August 18, 1930, to August 28, 1930), as 'Andre Verron' in "Miracle At Verdun" (October 25, 1932, to December 3, 1932), "The Tudor Wench" (1933-1934), as a presenter for the play, "All Over The Town" (October 6, 1947, to January 31, 1948), as 'Leofric' in "The Importance Of Wearing Clothes" (December 10, 1951, to January 1952), and as director of the play and as 'Slim Callaghan' in the play, "Meet Mr Callaghan" (February 25, 1952, to April 4, 1953, and again from, April 5, 1953, to July 11, 1953). During his stage career he appeared at or worked with, the Incorporated Stage Society, the New Theatre (now Noël Coward Theatre), in London, England, the Arts Theatre in London, England, the Prince of Wales Theatre in London, England, the Playhouse Theatre in London, England, the Comedy Theatre, in London, England, (now Harold Pinter Theatre, in London, England), the Malvern Theatre in Worcestershire, England, the New Theatre in Hull, England, the New Boltons Theatre Club in London, England, the Palace Theatre in Plymouth, England, the Golders Green Hippodrome in Golders Green, England, and the Garrick Theatre in London, England. He also appeared on the Broadway stage in New York City, New York, in several stage productions of such plays, as 'Danny Maitland' in "The Matriarch" (March 18, 1930, to March 1930), as 'Jerry Warrender' in "The Last Enemy" (October 30, 1930, to November 1930), and as 'Benjamin Disraeli' in "Young Mr. Disraeli" (November 10, 1937, to November 1937). He also became a manager and producer, in 1941 forming Concanen Productions with his brother the actor Terence De Marney (1908-1971), initially for the purpose of making wartime documentaries on the Polish Air Force including, "The White Eagle" (1942), and "Diary Of A Polish Airman" (1942), as well as actor, film director, film producer, and screenwriter Leslie Howard's film, "The Gentle Sex" (1943). He also co-founded with his brother the actor Terence Arthur De Marney (1908-1971), the Independent Theatre Club (formerly the Kingsway Theatre), in London, England, which was an outlet for works banned for various reasons by the Lord Chamberlain, and even promoted a troupe of Javanese dancers he had brought to his native England in the 1950s. During this time, he also made the transition to appearing in films. He made his actual film debut playing the role of 'Jack Carsdale' in the film drama, "Two Little Drummer Boys" (1928). The film which was directed by G.B. Samuelson, which was produced by John E. Blakeley, which was written for the screen by Walter Howard, and which also starred Wee Georgie Wood, Alma Taylor, Paul Cavanagh, Walter Byron, Julie Suedo, Cameron Carr, and Roy Travers, tells the story of a boy soldier who takes the blame for a theft by the captain's son, who later saves him from drowning. Besides, playing the role of 'Jack Carsdale' in the film drama, "Two Little Drummer Boys" (1928), and playing the role of 'George Grant' in the crime mystery thriller film drama, "Sleeping Car To Trieste" (1948), his many other film credits include, "The Forger" (1928), "Adventurous Youth" (1928), "The Valley Of Ghosts" (1930), "Shadows" (1931), "Strangehold" (1931), "The Conquest Of The Air" (1931), "Money For Nothing" (1932), "The Laughter Of Fools" (1933), "Music Hall" (1934), "The Scarlet Pimpernel" (1934), "Once In A New Moon" (1934), "The Immortal Gentlemen" (1935), "Windfall" (1935), "Things To Come" (1936), "Cafe Mascot" (1936), "Forbidden Music" (1936), "Young And Innocent" (1937), "The Pearls Of The Crown" (1937), "Victoria The Great" (1937), "Blond Cheat" (1938), "Queen Of Destiny" (1938), "Flying Fifty-Five" (1939), "The Lion Has Wings" (1939), "The Spider" (1940), "The Second Mrs. Bush" (1940), "Three Silent Men" (1940), "Suicide Squadron" (1941), "Spitfire" (1942), "Frenzy" (1945), "The Inheritance" (1947), "She Shall Have Murder" (1950), "Meet Mr. Callaghan" (1954), "Private's Progress" (1956), "The March Hare" (1956), and "Doomsday At Eleven" (1962). Besides, playing the role of 'Clive Errington' in the episode entitled, "The Desperate Diplomat," of the classic crime mystery television series, "Ghost Squad," which originally aired on May 18, 1963, his many other television credits include, "Lilli Palmer Theatre," "Armchair Theatre," "The New Adventures Of Charlie Chan," "Ivanhoe," and "Secret Agent." He was also a producer and an associate producer for the films, "The White Eagle" (1942), "Diary Of A Polish Airman" (1942), "Common Cause" (1942), "Seaman Frank Goes Back To Sea" (1942), "The Gentle Sex" (1943), "Niedokonczona podróz" (1943), "Marynarz polski - Dzieje przecietnego czlowieka" (1943), "Frenzy" (1945), "No Way Back" (1949), "She Shall Have Murder" (1950), and "Meet Mr. Callaghan" (1954). His last role was playing 'Latham' in the classic horror Sci-Fi film, "The Projected Man" (1966). The film which was directed by Ian Curtis and John Croydon, which was written for the screen by John Croydon, Peter Bryan, and Frank Quattrocchi, and which also starred Mary Peach, Bryant Haliday, Norman Wooland, Ronald Allen, Derek Farr, Norma Wet, Frank Gatliff, and Gerard Heinz, tells the story of a scientist who is experimenting with matter transmission from place to place by means of a laser beam who suddenly decides to use himself as a test specimen. But the process goes awry, and one side of his body becomes hideously deformed and instantly lethal to anyone iwho touches it. He retired from acting shortly thereafter but continued with other pursuits. He lived in the village of Farnham, in the area of Surrey, England, for the remainder of his life. He passed away peacefully from complications of bronchopneumonia and asthma at the Frimley Park Hospital in Frimley, England, on February 18, 1978, at the age of 72. Following his death, he was buried in the Family Plot in West Norwood Cemetery in West Norwood, England. He never married nor had any children, but was survived by his niece Jennifer. His brother the actor Terence Arthur De Marney passed away after accidently falling under a tube train at the High Street Kensington Underground Station in London, England, on May 25, 1971, at the age of 63, and he is also buried in the Family Plot in West Norwood Cemetery and Crematorium in West Norwood, England.