Paul Stewart (born Paul Sternberg; March 13, 1908 – February 17, 1986) was an American character actor, director and producer who worked in theatre, radio, films and television.
 He frequently portrayed cynical and sinister characters throughout his lengthy career.
 A friend and associate of Orson Welles for many years, he helped Welles get his first job in radio and was associate producer of the celebrated radio program "The War of the Worlds", in which he also performed.
 One of the Mercury Theatre players who made their film debut in Welles's landmark film "Citizen Kane", Stewart portrayed Kane's butler and valet, Raymond.
 He appeared in 50 films, and performed in or directed some 5,000 radio and television shows.
Robert Zigler Leonard (October 7, 1889 – August 27, 1968) was an American film director, actor, producer, and screenwriter.
Richard France (born May 5, 1938) is an American playwright, author, and film and drama critic.
 He is a recognized authority on the stage work of American filmmaker Orson Welles.
 His publication, "The Theatre of Orson Welles", which received a CHOICE Outstanding Academic Book Award in 1979, has been called "a landmark study" and has been translated into Japanese.
 His 1990 companion volume, "Orson Welles on Shakespeare" has been praised by Welles critics and biographers.
The Mercury Wonder Show for Service Men was a 1943 magic-and-variety stage show by the Mercury Theatre, produced by Orson Welles and Joseph Cotten as a morale-boosting entertainment for US soldiers in World War II.
 Directed by Welles, the show starred Welles ("Orson the Magnificent"), Cotten ("Jo-Jo the Great"), Agnes Moorehead ("Calliope Aggie") and Rita Hayworth, whose part was later filled by Marlene Dietrich.
 Jean Gabin also worked on the show backstage, as a propman.
 The show ran to 150 minutes.
The Mercury Summer Theatre on the Air (1946) is a CBS radio drama series produced, directed by and starring Orson Welles.
 It was a short-lived summer radio series sponsored by Pabst Blue Ribbon, on Friday evenings at 10 p.m. ET lasting 15 episodes.
 It harked back to Welles's earlier "The Mercury Theatre on the Air" (1938) and its successor, "The Campbell Playhouse", but was not able to replicate its success.
 The series offered 30-minute adaptations of classic plays and novels, plus some adaptations of popular motion pictures, whereas the original had offered more depth in its 60-minute running time.
 Although the Mercury Theatre troupe had disbanded when Welles was fired from RKO studios in 1942 and the Mercury players were dismissed with him, this radio series offered a reunion of many Mercury personnel, including Richard Wilson (who would direct the rehearsals) and composer Bernard Herrmann, as well as familiar actors such as Agnes Moorehead and William Alland.
Orson Welles is an impact crater in the Coprates quadrangle of Mars, located at 0.2° S and 45.9° W.
 It is 124.5 kilometers in diameter and was named after Orson Welles (1915–1985), an American radio and motion picture actor and director.
 He is famous for, among other things, his radio broadcast of "The War of the Worlds" by H. G. Wells in which Martians invade Earth.
 The layers and the clay minerals found in Orson Welles Crater are evidence that it once contained a lake.
This is Orson Welles is a 1992 book by Orson Welles (1915–1985) and Peter Bogdanovich that comprises conversations between the two filmmakers recorded over several years, beginning in 1969.
 The wide-ranging volume encompasses Welles's life and his own stage, radio and film work as well as his insights on the work of others.
 The interview book was transcribed by Bogdanovich after Welles's death, at the request of Welles's longtime companion and professional collaborator, Oja Kodar.
 Welles considered the book his autobiography.
George Orson Welles ( ; May 6, 1915 – October 10, 1985) was an American actor, director, writer, and producer who worked in theatre, radio, and film.
 He is remembered for his innovative work in all three: in theatre, most notably "Caesar" (1937), a Broadway adaptation of William Shakespeare's "Julius Caesar"; in radio, the legendary 1938 broadcast "The War of the Worlds"; and in film, "Citizen Kane" (1941), consistently ranked as one of the greatest films ever made.
Beatrice Giuditta Welles (Beatrice Mori di Gerfalco Welles; born November 13, 1955 in Manhattan, New York) is an American former child actress, known for her roles in the film "Chimes at Midnight" (1966) and the documentary travelogue "In the Land of Don Quixote" (1964).
 The daughter of filmmaker Orson Welles and Italian countess Paola Mori, she is a former model, radio and TV personality, founder of a cosmetics line and designer of handbags and jewelry.
 She administers the estate of Orson Welles.
Canada Lee (born Leonard Lionel Cornelius Canegata, March 3, 1907 – May 9, 1952) was an American actor who pioneered roles for African Americans.
 After careers as a jockey, boxer and musician, he became an actor in the Federal Theatre Project, most notably in a 1936 production of "Macbeth" adapted and directed by Orson Welles.
 Lee later starred in Welles's original Broadway production of "Native Son" (1941).
 A champion of civil rights in the 1930s and 1940s, Lee was blacklisted and died shortly before he was scheduled to appear before the House Un-American Activities Committee.
 He furthered the African-American tradition in theatre pioneered by such actors as Paul Robeson.
 Lee was the father of actor Carl Lee.

Question: Who was an American actor, director, writer, and producer who worked in theatre, radio, and film, Robert Z. Leonard or Orson Welles?
Answer: George Orson Welles