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Marek Posival (born 1 April 1963 in Prague) is a Czech Canadian screenwriter, producer, actor and film director.
A script penned by Posival, The Tortured, which was directed by Robert Lieberman, is currently slated for its UK release. Posival also worked on the project as one of the film's producers, together with Mark Burg, Oren Koules and Carl Mazzocone of Twisted Pictures.
Posival also wrote and directed a highly regarded short film called Hold Up and worked with Deepa Mehta as Associate Producer on the feature film Water which was among the five nominees for Best Foreign Language Film at the 2006 Academy Awards.