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Mark Cullen and Robb Cullen are brothers and American film and television writers and producers, who usually work together. The brothers have created multiple primetime TV series – Hitz for UPN, Lucky for FX, Gary The Rat for SpikeTV, and Heist for NBC. The Cullen brothers co-created and executive produced Back in the Game on ABC, as well as Mr. Robinson for NBC. They have also written and produced multiple pilots for Fox, NBC, ABC, HBO and Showtime. Wikipedia