
Mark David Duplass (born December 7, 1976) is an American filmmaker, actor, writer, and musician. With his brother Jay Duplass, he started the film production company Duplass Brothers Productions in 1996, for which they wrote and directed The Puffy Chair (2005), Baghead (2008), Cyrus (2010), Jeff, Who Lives at Home (2011), and The Do-Deca-Pentathlon (2012).
Duplass co-wrote and starred in the horror film Creep (2014) and its sequel Creep 2 (2017), as well as the television spin-off The Creep Tapes (2024). He co-wrote and co-produced the television anthology series Room 104 (2017–2020). His other acting credits include Humpday (2009), The League (2009–2015), Greenberg (2010), Safety Not Guaranteed (2012), The One I Love (2014), The Lazarus Effect (2015), Togetherness (2015–2016), Blue Jay (2016), Tully (2018), Goliath (2018–2019), Paddleton (2019), and Language Lessons (2021).
For his portrayal of Charlie "Chip" Black in The Morning Show (2019–present), Duplass received two nominations for the Primetime Emmy Award for Outstanding Supporting Actor in a Drama Series. He was also the lead singer of the indie rock band Volcano, I'm Still Excited!!
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Backrooms
2026 · as Phil

Zero Dark Thirty
2012 · as Steve

Love Sonia
2018 · as Man in LA

Creep
2014 · as Josef

Parkland
2013 · as Kenneth O'Donnell

Bombshell
2019 · as Doug Brunt

People Like Us
2012 · as Ted

Creep 2
2017 · as Aaron

Safety Not Guaranteed
2012 · as Kenneth

The One I Love
2014 · as Ethan

Tully
2018 · as Craig

Darling Companion
2012 · as Bryan

Tammy
2014 · as Bobby

Duck Butter
2018 · as Mark

The Lazarus Effect
2015 · as Frank Walton

Paddleton
2019 · as Michael

Greenberg
2010 · as Eric Beller (Beller's Party)

Blue Jay
2016 · as Jim