Were both Hal Hartley and Mervyn LeRoy producers?
yes
Mervyn LeRoy
Mervyn LeRoy (October 15, 1900 – September 13, 1987) was an American film director, film producer and occasional actor.
Hal Hartley
Hal Hartley (born November 3, 1959) is an American film director, screenwriter, producer and composer who became a key figure in the American independent film movement of the 1980s and '90s.
 He is best known for his films "Trust", "Amateur" and "Henry Fool", which are notable for deadpan humour and offbeat characters quoting philosophical dialogue.
Warner LeRoy
Warner LeRoy (March 3, 1935 – February 22, 2001), was a New York businessman.
 LeRoy was the son of film producer-director Mervyn LeRoy and Mervyn's second wife, Doris Warner, and was the grandson of Harry Warner, one of the founders of Warner Bros. and a major contributor to the development of the film industry. Ned Rifle
Ned Rifle is a 2014 American drama film written and directed by Hal Hartley.
 It is the third and final film in a trilogy following characters introduced in Hartley's 1997 film "Henry Fool" and 2006 sequel "Fay Grim".
 "Ned Rifle" stars Liam Aiken as the title character, reprising his role from the other two films, as well as Aubrey Plaza, Parker Posey, James Urbaniak, and Thomas Jay Ryan. Henry Fool
Henry Fool is a 1997 American black comedy-drama film written, produced and directed by Hal Hartley, featuring Thomas Jay Ryan, James Urbaniak, and Parker Posey.
 As in "The Unbelievable Truth", an earlier Hartley film, expectation and reality again conflict. Damian Young
Damian Young (born October 27, 1961) is an American actor notable for his appearance in the Hal Hartley film "Amateur" (1994).
 He also featured in Hartley's film "Simple Men," and has appeared in theatre, television and film.
 He played bus driver Stu Benedict in "The Adventures of Pete & Pete", and more recently Gabriel in "Birdman or (The Unexpected Virtue of Ignorance)". Martin Donovan
Martin Donovan (born August 19, 1957) is an American film, stage and television actor.
 He has had a long collaboration with director Hal Hartley and appeared in many of Hartley's films, such as "Trust" (1990), "Surviving Desire" (1991), "Simple Men" (1992), "Flirt" (1993), "Amateur" (1994), and "The Book of Life" (1998; in which he played Jesus).
 Donovan also played Peter Scottson on Showtime's cable series "Weeds".
 He made his writing/directorial debut with the film "Collaborator" (2011). Waterloo Bridge (1940 film)
Waterloo Bridge is a 1940 remake of the 1931 American drama film also called "Waterloo Bridge", adapted from the 1930 play "Waterloo Bridge".
 In an extended flashback narration, it recounts the story of a dancer and an army captain who meet by chance on Waterloo Bridge.
 The film was made by Metro-Goldwyn-Mayer, directed by Mervyn LeRoy and produced by Sidney Franklin and Mervyn LeRoy.
 The screenplay is by S. N. Behrman, Hans Rameau and George Froeschel, based on the Broadway drama by Robert E. Sherwood.
 The music is by Herbert Stothart and cinematography by Joseph Ruttenberg. Fay Grim
Fay Grim is a 2006 Espionage thriller drama film written and directed by Hal Hartley.
 The film is a sequel to Hartley's 1997 film "Henry Fool", and revolves around the title character, played by Parker Posey, the sister of Simon Grim (James Urbaniak).
 The plot revolves around Fay's attempt to unravel an increasingly violent mystery in Europe. W-L Ranch Co.
W-L Ranch Co. was an American Thoroughbred horse racing and breeding partnership between Hollywood film studio executive Harry M. Warner and film director Mervyn LeRoy.
 Warner's daughter, Doris, was married to Mervyn LeRoy.