Mark Day is a BAFTA-winning British film editor. He won two BAFTA Awards for Best Editing for State of Play and Sex Traffic. He has collaborated with director David Yates on the television dramas Sex Traffic, State of Play and The Girl in the Café and has edited over thirty television films. He has also worked with Yates on a number of Harry Potter films including Order of the Phoenix, Half-Blood Prince and the two-part epic Deathly Hallows. Day is set to edit an upcoming 2012 film called St. Nazaire, which Yates will be directing.