John Curran Director Jason Clarke Sen. Ted Kennedy Actor Kate Mara Mary Jo Kopechne Actor Ed Helms Joe Gargan Actor Bruce Dern Joe Kennedy Actor Jim Gaffigan Paul Markham Actor Olivia Thirlby Rachel Schiff Actor Clancy Brown Robert McNamara Actor Taylor Nichols Ted Sorensen Actor Andria Blackman Joan Kennedy Actor Tamara Hickey Marilyn Richards Actor Victor Warren Stephen Edward Smith Actor Alison Wachtler Liz Trotta Actor Donald Watson Dr. Watt Actor Joe Chase John Farrar Actor Taylor Allen Screenwriter, Executive Producer Andrew Logan Screenwriter, Executive Producer Mark Ciardi Producer Campbell McInnes Producer Chris Cowles Producer Chris Fenton Executive Producer Daniel Mintz Executive Producer Douglas S. Jones Executive Producer Tom Duterme Executive Producer Stephen Schuler Executive Producer Ben Rose Executive Producer Maryse Alberti Cinematographer Keith Fraase Film Editing Garth Stevenson Original Music John Goldsmith Production Design Jennifer Engel Set Decoration David Robinson Costume Design Lisa Lobel Casting Marisol Roncali Casting Mary Vernieu Casting