Jean-Marc Vallée Director, Film Editing Matthew McConaughey Ron Woodroof Actor Jennifer Garner Dr. Eve Saks Actor Jared Leto Rayon Actor Denis O'Hare Dr. Sevard Actor Steve Zahn Tucker Actor Michael O'Neill Richard Barkley Actor Dallas Roberts David Wayne Actor Griffin Dunne Dr. Vass Actor Kevin Rankin T.J. Actor Craig Borten Screenwriter Melisa Wallack Screenwriter Rachel Winter Producer Robbie Brenner Producer David Bushell Executive Producer Nathan Ross Executive Producer Tony Notargiacomo Executive Producer Joe Newcomb Executive Producer Nicolas Chartier Executive Producer Cassian Elwes Executive Producer Zev Foreman Executive Producer Logan Levy Executive Producer Holly Wiersma Executive Producer Yves Bélanger Cinematographer Martin Pensa Film Editing John Paino Production Design Javiera Varas Art Director Robert Covelman Set Decoration Kurt & Bart Costume Design Kerry Barden Casting Paul Schnee Casting Rich Delia Casting