question: Who was also a producer, in addition to being a director, Alexander Mackendrick or Peter Chan?
answer: Peter Ho-sun Chan
context: Title: Alexander Mackendrick
  Passage: Alexander Mackendrick (September 8, 1912 – December 22, 1993) was an American born Scottish director and teacher.  He was born in Boston, Massachusetts and later moved to Scotland.  He began making television commercials before moving into post-production editing and directing films, most notably for Ealing Studios where his films include "Whisky Galore! " (1949), "The Man in the White Suit" (1951), and "The Ladykillers" (1955).
  Title: The Man in the White Suit
  Passage: The Man In The White Suit is a 1951 science-fiction satirical comedy film made by Ealing Studios.  It starred Alec Guinness, Joan Greenwood and Cecil Parker and was directed by Alexander Mackendrick.  The film was nominated for an Academy Award for Best Writing (Screenplay) for Roger MacDougall, John Dighton and Alexander Mackendrick (who was a cousin of Roger MacDougall).
  Title: Peter Chan
  Passage: Peter Ho-sun Chan (born 28 November 1962) is a film director and producer.
citations: Alexander Mackendrick Peter Chan