Brian Geraghty
Brian Geraghty
as Ronald Pergman

Actor Biography

Brian Geraghty's unique combination of intensity and charisma has made him a favorite among auteurs and A-listers alike. While perhaps best known for his role as the tightly wound bomb specialist in Kathryn Bigelow's Oscar®-winning film "The Hurt Locker," Geraghty also popped as the co-pilot-turned-religious zealot in Robert Zemeckis' much-lauded drama "Flight," opposite Denzel Washington. His résumé lists such esteemed and eclectic collaborators as Martin Scorsese, Sam Mendes, McG, Jake Paltrow, Carlos Cuaron, playwright Jessica Goldberg and indie darling Kyle Alvarez. Geraghty's scene-stealing role as Warren Knox—a rookie FBI agent whose baby face and Midwestern charm mask his true nature as a vicious, unhinged sociopath—among the pedigreed cast of Scorsese's "Boardwalk Empire" further showcases his versatility and skill, and proved to be one of the show's most diabolical villains.

Most recently, Geraghty was seen starring in Sam Esmail's drama anthology "Briarpatch" for the USA Network, opposite Rosario Dawson, Kim Dickens and Alan Cumming. Ana Lily Amirpour directed the pilot and the show had its world premiere at last year's Toronto Film Festival to rave reviews.

In 2018, he starred as Theodore Roosevelt opposite Daniel Bruhl, Dakota Fanning and Luke Evans in TNT's "The Alienist," which went on to receive six Emmy® nominations. That year, Geraghty also appeared in indie feature "The Standoff at Sparrow Creek," which also premiered at the Toronto Film Festival, opposite James Badge Dale, and "Extremely Wicked, Shockingly Evil and Vile" with Zac Efron.

Other notable credits include Showtime's acclaimed drama "Ray Donovan" and Killer Films' "My Days of Mercy" with Kate Mara, Ellen Page and Amy Seimetz.

Geraghty will next star in the limited series "Big Sky" for creator David E. Kelley.