Joshua Regnall Stewart, born on February 6, 1977, is an American actor who has built a versatile career across television and film, earning recognition for his intense performances and frequent collaborations with acclaimed director Christopher Nolan. Stewart’s breakout came with a main role as Officer Brendan Finney on the sixth and final season of the NBC crime drama Third Watch from 2004 to 2005. Following that, he secured a main role as Holt McLaren on the FX series Dirt from 2007 to 2008, and later took on a recurring role as Detective William LaMontagne Jr. on the CBS and Paramount+ procedural Criminal Minds, appearing intermittently from 2007 through 2025. During the late 2000s and early 2010s, Stewart expanded into film, landing supporting roles in The Haunting of Molly Hartley (2008), The Curious Case of Benjamin Button (2008), and Law Abiding Citizen (2009), while also taking the lead in the horror films The Collector (2009) and its sequel The Collection (2012). He further showcased his range with a main role as the Watcher on the ABC series No Ordinary Family from 2010 to 2011, and made his directorial debut with The Hunted (2013), in which he also starred.

In the 2010s, Stewart continued to build an impressive filmography with supporting roles in Transcendence (2014), The Finest Hours (2016), War Machine (2017), Insidious: The Last Key (2018), and The Mustang (2019). He also took on main roles on television, portraying Solotov on season two of the USA Network series Shooter from 2017 to 2018, and John Pilgrim on the Netflix series The Punisher in 2019. Stewart’s career has been notably marked by a series of collaborations with director Christopher Nolan, appearing in supporting roles in The Dark Knight Rises (2012), Interstellar (2014), and Tenet (2020), and he is set to appear in Nolan’s upcoming film The Odyssey in 2026. In the 2020s, Stewart took on a recurring role as Wallace on the Apple TV+ miniseries Manhunt (2024), demonstrating his continued relevance in both film and television. With a career spanning over two decades, Stewart has established himself as a reliable character actor capable of delivering compelling performances across genres, from crime dramas to blockbuster spectacles.