Before beginning his film career in 1998, Rosen worked on the staff of Senator Dianne Feinstein.
[2] From 2012 to 2015, Rosen was the co-founder and CEO of Georgeville Television with Reliance Entertainment – the proprietors of DreamWorks.
During GVTV's run, Rosen set up several projects, including Limitless, The After, From Dusk til Dawn, and Zorro.
Leading up to those deals, from 2001 to 2007, Rosen was a senior executive and founded and ran the Warner Brothers offices of Heyday Films/David Heyman.
[citation needed] Rosen is managed by Anonymous Content as an executive producer, creator, and writer.