Domhnall Gleeson as Sam Fortner in The Patient on FX

Domhnall Gleeson

Sam Fortner

On the surface, "Sam Fortner," portrayed by Domhnall Gleeson, seems like a shy, likable young man — someone you wouldn’t look at twice. Underneath his quiet exterior lurks a dangerous unpredictability that he tries to manage through therapy with Dr. Alan Strauss. 

Career Highlights

Domhnall Gleeson will next be seen in David Mandel’s White House Plumbers for HBO, in which he plays John Dean opposite Woody Harrelson and Justin Theroux as Howard Hunt and G. Gordon Liddy. Most recently, Gleeson appeared in Frank of Ireland for Channel 4 and Amazon, a series he also co-produced and wrote with Michael Moloney and his brother Brian Gleeson, and in Peter Rabbit 2: The Runaway, a sequel to the international blockbuster Peter Rabbit, again opposite Rose Byrne and James Corden.   

Previously, Gleeson starred opposite Merritt Wever in Run for HBO. His films include Star Wars: The Rise of SkywalkerStar Wars: The Last Jedi and Star Wars: The Force AwakensThe Kitchen opposite Melissa McCarthy, Tiffany Haddish and Elisabeth Moss; Lenny Abrahamson’s The Little Stranger opposite Ruth Wilson; Simon Curtis’ Goodbye Christopher Robin opposite Margot Robbie; American Made opposite Tom Cruise for Doug Liman; Darren Aronofsky’s Mother!;  David Wain’s A Futile & Stupid Gesture; John Crowley’s Brooklyn; Alejandro Iñárritu’s The Revenant; Alex Garland’s Ex Machina; Angelina Jolie’s Unbroken; Lenny Abrahamson’s Frank; Richard Curtis’ About Time; and Joe Wright’s Anna Karenina.

Gleeson starred in a sold-out run of Enda Walsh’s play Medicine at New York’s St. Ann’s Warehouse in late 2021, garnering rave reviews for his performance and the production. He was nominated for a Tony Award® for his Broadway debut in Martin McDonagh’s Lieutenant of Inishmore.

Linda Emond headshot wearing a pattern shirt and sweater

Linda Emond

as Candace Fortner

While close to her son, Candace struggles to balance her unconditional love for him with a sense of right and wrong.