Ben Foster on Living Off the Grid in “Leave No Trace”

Ben Foster stars in Debra Granik’s new film, “Leave No Trace,” as a veteran with PTSD who lives in a public park with his daughter. It is based on Peter Rock’s novel My Abandonment, which itself inspired by a news story reporting that a father and daughter were living off the grid but in plain sight. Writer/director Debra Granik (“Winter’s Bone”) adapted the story in a quiet wonder of a film co-starring newcomer Thomasin Harcourt McKenzie. I spoke to Ben Foster about preparing for the role and what it meant to him as a new father himself.