Question: What is the shared occupation of Donald Cammell and Leopold Wharton?

Context paragraphs:
China Kong: China Kong (born 1960) is an American actor, writer, and producer.  She is the widow of director Donald Cammell, having met him when she was 14 years of age and he was 40 years of age in 1974.  After having an affair, the two would wed 4 years later in 1978.

Donald Cammell: Donald Seaton Cammell (17 January 1934 – 24 April 1996) was a Scottish film director who has a cult reputation thanks to his debut film "Performance", which he co-directed with Nicolas Roeg.

Demon Seed: Demon Seed is a 1977 American science fiction–horror film directed by Donald Cammell.  It stars Julie Christie and Fritz Weaver.  The film was based on the novel of the same name by Dean Koontz, and concerns the imprisonment and forced impregnation of a woman by an artificially intelligent computer.  Gerrit Graham, Berry Kroeger, Lisa Lu and Larry J. Blake also appear in the film, with Robert Vaughn uncredited as the voice of the computer.

Performance (film): Performance is a 1970 British crime drama film directed by Donald Cammell and Nicolas Roeg, written by Cammell and photographed by Roeg.  The film stars James Fox as a violent and ambitious London gangster who, after carrying out an unordered killing, goes into hiding at the home of a reclusive rock star (Mick Jagger of The Rolling Stones, in his film acting debut).

The Eagle's Eye: The Eagle's Eye is a 1918 American serial film consisting of 20 episodes that dramatizes German espionage in the United States during World War I.  It features King Baggot in the lead role as the daring espionage agent.  Among the events depicted are the sending of the Zimmermann Telegram, Franz von Rintelen's attempts to sabotage cargo loading in San Francisco Harbor, and the capture of the German espionage plans.  It was directed by George Lessey, Wellington A. Playter, Leopold Wharton, and Theodore Wharton, and produced by the Whartons Studio.  The serial is now considered lost.  Because this serial was a commercial failure, it was the last one made by Whartons due to the studio being forced to declare bankruptcy.

The Touchables (film): The Touchables is a 1968 British film directed by Robert Freeman and written by Ian La Frenais from a story by Donald Cammell.  It stars Judy Huxtable, Esther Anderson and James Villiers.

Wild Side (1995 film): Wild Side is a 1995 film co-written and directed by Donald Cammell.  It went straight to video and stars Christopher Walken, Joan Chen, Anne Heche, and Steven Bauer.

White of the Eye (film): White of the Eye is a 1987 British thriller film directed by Donald Cammell and starring David Keith and Cathy Moriarty.  It was adapted by Cammell and his wife China Kong from the 1983 novel "Mrs. White", written by Margaret Tracy (pseudonym of the brothers Laurence and Andrew Klavan).

Performance (soundtrack): Performance is a 1970 soundtrack album to the film "Performance" by Donald Cammell and Nicolas Roeg.  It features music from Randy Newman, Merry Clayton, Ry Cooder, Jack Nitzsche, Buffy Sainte-Marie, The Last Poets and Mick Jagger.

Leopold Wharton: Leopold Wharton (September 1, 1870 – September 27, 1927) was an American film director, producer and writer.  He directed 37 films between 1911 and 1922, including the 1915 film "The New Adventures of J. Rufus Wallingford", which featured Oliver Hardy.

Supporting paragraphs: Donald Cammell Leopold Wharton
Answer: film director