Warner Bros. Pictures has hired Australian-born Gregor Jordan ("Ned Kelly", "Buffalo Soldiers") to direct action drama "Under and Alone," which Mel Gibson and partner Bruce Davey are producing reports Variety.

"Under" is based on the real-life story of William Queen, an ATF undercover agent who infiltrated the notorious and violent San Fernando Valley chapter of the Mongols motorcycle gang.

Jordan is doing a rewrite of the script penned by Daniel Barnz and Ned Zeman. Casting hasn't been announced, Gibson was originally supposed to star in the pic but changed his plans because of directorial project "Apocalypto".

Earlier this year, Jordan was hired to rewrite and direct the adaptation of John Christopher's "The Tripods Trilogy" for Disney.