Max Greenfield has joined Paul Rudd and Amy Poehler in the cast of They Came Together. Greenfield, seen on Fox’s New Girl, will play the wayward couch surfing younger brother of Rudd’s character. David Wain directs the romantic comedy. Wain wrote the script with Michael Showalter. The duo last worked together on Wet Hot American Summer. Lionsgate is behind They Came Together. Showalter will produce. Wain will be the Executive Producer. Greenfield is repped by WME and Greenlight Management.