The Mountainhead cast features Steve Carell, Jason Schwartzman and Cory Michael Smith. This info article contains minor spoilers and character details for Jesse Armstrong’s 2025 HBO Max movie. Check out more cast guides in Vague Visages’ Know the Cast category.

Mountainhead centers on a group of tech entrepreneurs. As four businessmen reunite in rural Utah, they celebrate their accomplishments and cultural identities. The narrative follows the main protagonists as they theorize about their global reputations. Here’s every actor and character in Mountainhead.

Read More at VV — Know the Cast: ‘Sinners’

Mountainhead Cast: Steve Carell as Randall

Character Profile: A billionaire dying from cancer. He theorizes about living in a “post-human” world. Randall turns against one of his billionaire friends.

Carell’s Resume: Michael Scott in The Office (2005-13), Andy in The 40-Year-Old Virgin (2005), John du Pont in Foxcatcher (2014), Mark Baum in The Big Short (2015), Mitch Kessler in The Morning Show (2019-21)

Read More at VV — Know the Cast: ‘Caddo Lake’

Mountainhead Cast: Jason Schwartzman as Souper/Hugo Van Yalk

Character Profile: A multi-millionaire who hosts friends at his Utah home. He feels insecure about not being a billionaire like his pals. Hugo aka “Souper” hopes to develop a “lifestyle super-app.”

Schwartzman’s Resume: Max Fischer in Rushmore (1998), Ethan Dulles in Slackers (2002), Jack in The Darjeeling Limited (2007), Gideon Graves in Scott Pilgrim vs. the World (2010), Cousin Ben in Moonrise Kingdom (2012)

Read More at VV — Know the Cast: ‘A Different Man’

Mountainhead Cast: Cory Michael Smith as Venis

Character Profile: The founder of Traam. He gets accused of starting a race war due to his deepfake technology. Venis makes flippant statement about the consequences of his work while hanging out with his tech entrepreneur friends.

Smith’s Resume: Edward Nygma/The Riddler in Gotham (2014-19), Tommy Tucker in Carol (2015), Varian Fry in Transatlantic (2023), Georgie in May December (2023), Chevy Chase in Saturday Night (2025)

Read More at VV — Know the Cast: ‘The Brutalist’

Mountainhead Cast: Ramy Youssef as Jeff

Character Profile: A billionaire. His “Bilter” app technology helps users identify deepfake videos. Jeff becomes the central figure in a murder conspiracy.

Youssef’s Resume: Kevin in See Dad Run (2012-14), Samar Swailem in Mr. Robot (2017), Ramy in Ramy (2019-2022), Safi in Wish (2023), Max McCandles in Poor Things (2024)

Read More at VV — Know the Cast: ‘The Iron Claw’

The Mountainhead cast also includes:

• Daniel Oreskes as Dr. Phipps
• Hadley Robinson as Hester
• David Thompson as Leo
• Ali Kinkade as Berry Oliphant
• Ava Kostia as Paula
• Alex Peña as Argentinian Business Leader
• Amie MacKenzie as Janine
• Larkin Bell as Nanny
• Capri Eaton as Baby Sabre
• Emmi Eaton as Baby Sabre

Q.V. Hough (@QVHough) is Vague Visages’ founding editor.