Jimmi Simpson, born on November 21, 1975, is a highly versatile American actor who has earned critical acclaim across film, television, and theatre, amassing nominations for a BAFTA, a Primetime Emmy, and a Screen Actors Guild Award. He is perhaps best known to mainstream audiences for his deeply committed and often eccentric character work, most notably as the unforgettable Liam McPoyle on the long-running comedy series It's Always Sunny in Philadelphia, a role he played from 2005 to 2023 that became a cult favorite. Simpson's career, however, extends far beyond comedic turns, encompassing dramatic depth in prestige television and a wide array of film roles.
Simpson made his feature film debut in the 2000 comedy Loser, and over the following decades, he built an impressive resume of supporting roles in major motion pictures. His filmography includes appearances in family comedies like Herbie: Fully Loaded, the chilling David Fincher crime drama Zodiac, the action-comedy Date Night, the genre-bending Abraham Lincoln: Vampire Hunter, the political thriller White House Down, the neo-noir mystery Under the Silver Lake, and the intense road rage thriller Unhinged. These roles showcased his ability to disappear into a wide variety of characters, from sinister figures to comedic sidekicks.
On the small screen, Simpson's career has been particularly distinguished by a series of compelling performances in some of the most acclaimed series of the last two decades. He played the quirky romantic interest in Psych and a criminal mastermind in the drama Breakout Kings. His dramatic range was further displayed in roles on The Newsroom, House of Cards, and Hap and Leonard. However, his most lauded television work came in two landmark series: he delivered a haunting and layered performance as the mysterious William in the first two seasons of HBO's sci-fi epic Westworld, and he won a Primetime Emmy Award for Outstanding Guest Actor in a Drama Series for his chilling portrayal of a hacker in the acclaimed Netflix anthology Black Mirror. He later returned to the Black Mirror universe in 2025. Simpson continued to build on this success with starring roles in the series Unsolved, Perpetual Grace, LTD, The Man Who Fell to Earth, the epic drama Pachinko, and the sci-fi series Dark Matter.
Beyond his screen work, Simpson has also made a significant mark on the stage. He earned a Theatre World Award for his portrayal of Philo Farnsworth in the Broadway production of The Farnsworth Invention during the 2007-2008 season, a performance that underscored his formidable talent as a stage actor. With a career defined by a fearless commitment to his craft and a knack for choosing complex, memorable roles, Jimmi Simpson remains a respected and sought-after presence in the entertainment industry.