Mark Daniel Bailey (born November 21, 1968) is an American writer, best known for his documentary films, including American Hollow (1999), Pandemic: Facing AIDS (2003) and The Fence (2010). He is married to Rory Kennedy, posthumous daughter of Robert F. Kennedy. It was to their 1999 wedding that her cousin John F. Kennedy Jr was flying when his plane crashed into the sea, killing all on board.