Unmarried is a 1920 British silent drama film directed by Rex Wilson and starring Gerald du Maurier, Malvina Longfellow and Edmund Gwenn.
 The film portrays an unmarried mother and the social workers who support her.
Poseidon Rex is a 2013 horror film directed by Mark L. Lester.
The Base is a 1999 action/thriller film written by Jeff Albert and Hesh Rephun, produced by Dana Dubosky and Mark L. Lester, directed by Mark L. Lester and starring Mark Dacascos, Tim Abell and Paula Trickey.
Onward Christian Soldiers is a 1918 British silent romance film directed by Rex Wilson and starring Isobel Elsom, Owen Nares and Minna Grey.
The Base 2: Guilty as Charged is a 2000 action/adventure film written by C. Courtney Joyner and Jeff Albert, produced Dana Dubovsky and Mark L. Lester, directed by Mark L. Lester and starring Antonio Sabato Jr. and James Remar.
 It is also the sequel to the 1999 film "The Base".
Tilly of Bloomsbury is a 1921 British silent comedy film directed by Rex Wilson and starring Edna Best, Tom Reynolds, Henry Kendall and Isabel Jeans.
 It is based on the play "Tilly of Bloomsbury" by Ian Hay, and was the first of three film adaptations.
Mark L. Lester (born November 26, 1946) is an American film director, screenwriter, and producer.
 He is best known as a prolific director of cult films including the disco musical "Roller Boogie", the vigilante thriller film "Class of 1984", the Stephen King-adaptation "Firestarter" (1984), the Arnold Schwarzenegger action film "Commando" (1985), and the action-comedy "Armed and Dangerous" (1986), starring John Candy, Eugene Levy, and Meg Ryan.
Rex Wilson (1873–1951) was a British film director of the silent era.
 until he was caught molesting a child actor on the set of his 1923 film, St. Elmo.
 Unable to find work, he moved to New Zealand to take up teaching.
Mrs. Thompson is a 1919 British silent drama film directed by Rex Wilson and starring Minna Grey, C.M. Hallard and Isobel Elsom.
 It was released in the United States on 6 April 1923.
 It was adapted from a novel by William Babington Maxwell.
Quinneys is a 1919 British romance film directed by Rex Wilson and starring Henry Ainley, Isobel Elsom and Eric Harrison.
 It is an adaptation of the play "Quinneys" by Horace Annesley Vachell which was again made into a film in 1927.

Question: Who was a successful film director, Rex Wilson or Mark L. Lester?
Answer: Mark L. Lester