John Michael McDonagh Director, Screenwriter Brendan Gleeson Sergeant Gerry Boyle Actor Don Cheadle FBI agent Wendell Everett Actor, Executive Producer Liam Cunningham Francis Sheehy Actor David Wilmot Liam O'Leary Actor Rory Keenan Garda Aidan McBride Actor Mark Strong Clive Cornell Actor Fionnula Flanagan Eileen Boyle Actor Dominique McElligott Aoife O'Carroll Actor Sarah Greene Sinead Mulligan Actor Katarina Cas Gabriela McBride Actor Mícheál Óg Lane Eugene Moloney Actor Chris Clark Producer Flora Fernandez-Marengo Producer Ed Guiney Producer Andrew Lowe Producer Martin McDonagh Executive Producer Paul Brett Executive Producer Ralph Kamp Executive Producer Lenore Zerman Executive Producer Tim Smith Executive Producer David Nash Executive Producer Larry Smith Cinematographer Chris Gill Film Editing Calexico Original Music John Paul Kelly Production Design Lucy van Lonkhuyzen Art Director Eimer Ni Mhaoldomhnaigh Costume Design Jina Jay Casting