Berg's exit comes as Zack Snyder's Justice League is underperforming at the box office, having grossed $572.1 million globally to date since its Nov. 7 release. (The film had a reported $300 million budget, including the reshoots that were helmed by Joss Whedon.)

“This is something that Jon approached me about six months ago, and he expressed his goal was to ultimately be a producer at the studio," Warner Bros. Pictures Group president Toby Emmerich said Thursday in a statement, "I first met Jon when, as a producer, he brought Elf to New Line, which remains one of the best and most evergreen titles in the library. We’re thrilled that Jon is partnering with Roy and anticipate their company being a valuable source of movies for Warner Bros. and New Line.”

Berg was first tapped to run point (along with Johns) on DC features in May 2016 by then Warner Bros. Pictures president Greg Silverman after the fallout from the poor critical and commercial performance of Batman v. Superman: Dawn of Justice. Emmerich is expected to name a new person to oversee the studio's comic book projects in the near future.

Berg's DC credits include the hit Wonder Woman, which has pulled in over $800 million at the box office, as well as the upcoming Aquaman stand-alone, which is due out in December 2018.