Gerard Butler has launched the production shingle Evil Twins with his longtime manager, Alan Siegel.

Their first project is the psychological thriller “Law Abiding Citizen,” which the duo are producing for Mark Gill, Neil Sacker and Robert Katz’s the Film Department.

Butler will star as a successful assistant D.A. who finds himself at the center of a vigilante plot hatched by a traumatized victim of the legal system.

Kurt Wimmer (“The Thomas Crown Affair”) wrote the screenplay. Warp Films’ Lucas Foster and Wimmer are also producing. Shooting will begin in the summer.

Butler and Siegel, who have worked together for 11 years, have several projects in development at Evil Twins. They will produce “Hanging Tale,” penned by Danny Rubin, with Lightstorm Entertainment; and “Teacher Man,” based on Frank McCourt’s novel. Ronald Bass is adapting as well as producing; Howard and Karen Baldwinalso produce.

“We’re thrilled at the opportunity that Gerry’s career has given us to make our own films,” Siegel said.

Danielle Robinson has been named director of development for the banner.

Butler, who starred in “300” and “P.S. I Love You,” will soon begin production on romantic comedy “The Ugly Truth,” opposite Katherine Heigl. He recently wrapped the futuristic action film “Game.” He next appears in “Nim’s Island” and Guy Ritchie’s “RocknRolla.”