EXCLUSIVE: Ron Livingston has joined the cast of HBO’s Boardwalk Empire as a new series regular for the period drama’s upcoming fourth season. He will play Roy Phillips, a wealthy out-of-town businessman who catches the eye of Gillian Darmody (Gretchen Mol). Season 4 is currently in production and will debut later this year. This marks Livingston’s return to HBO where he co-starred on the Emmy-winning Sex And The City, Band Of Brothers and, most recently, Game Change. This year, Livingston, repped by UTA and Thruline, appears in several movies, including Lynn Shelton’s Touchy Feely, which premiered at Sundance, Drinking Buddies, which premieres at SXSW, and New Line’s supernatural thriller The Conjuring. He just wrapped Parkland. Boardwalk Empire is executive produced by creator Terry Winter, Martin Scorsese, Mark Wahlberg, Stephen Levinson, Tim Van Patten and Howard Korder and co-executive produced by Gene Kelly.