David Fynn is a British-Irish actor, producer and screenwriter, he received a nomination for the Olivier Award for Best Actor in a Musical in 2017, playing Dewey Finn in School of Rock. He is most notable for playing Brett in the NBC TV sitcom Undateable (2014–2016).
Other credits include Spooks (2006), The Inbetweeners (2009), Peep Show (2010), Doctor Who (2010), Black Mirror (2011), Life’s Too Short (2011), Pete versus Life (2011), Game of Thrones (2012), Big Bad World (2013), Mayday (2013), Sherlock (2014), The Job Lot (2014), Banana (2015), The Pembrokeshire Murders (2021), The Thief, His Wife and the Canoe (2022), and Am I Being Unreasonable? (2022-2025).
Theatre His theatre credits include She Stoops to Conquer at the National Theatre, (Evening Standard Nomination), Romeo and Juliet at the National Theatre, The 25th Annual Putnam County Spelling Bee at the Donmar Warehouse, Mojo at the Royal Shakespeare Company, After the Party in the West End, and Starving at Theatre503. He trained at the Webber Douglas Academy of Dramatic Art.
He began playing Dewey Finn in the West End cast of Andrew Lloyd Webber's musical School of Rock (based on the 2003 film with Jack Black) in October 2016 at the New London Theatre, for which he received a nomination for the Olivier Award for Best Actor in a Musical in 2017. In 2026, he began playing the main role in Beetlejuice (musical) at the Prince Edward Theatre.
Television He made his television debut in 2006 in Spooks. include The Inbetweeners (2009), Peep Show (2010), Doctor Who (2010), Black Mirror (2011), Life’s Too Short (2011), Pete versus Life (2011), Game of Thrones (2012), Big Bad World (2013), Mayday (2013), Sherlock (2014), The Job Lot (2014), and Banana (2015).
He is most notable for playing Brett in 36 episodes of the NBC TV sitcom Undateable (2014–2016). He starred alongside Olivia Cooke and Anthony Head in the historical drama miniseries Vanity Fair (2018).
In January 2021, he appeared as one of the lead characters, journalist Jonathan Hill, in the ITV miniseries The Pembrokeshire Murders (2021). In 2022, he played the part of a journalist in ITV's The Thief, His Wife and the Canoe (2022), and Alex in the BBC's Am I Being Unreasonable? (2022-2025).
Filmography Film Year Title RoleNotes2010 Leap Year Agent Trackdown Fat Mike2011 The Somnambulists Man 2 Showreel Ben2012 Deviation Justin National Theatre Live: She Stoops to Conquer Tony Lumpkin 2013 The Look of Love Interviewer2019 I'd Like to Be Alone Now Sam Married Young David 2021 The Mauritanian Kent 2022 National Theatre Live: Much Ado About Nothing Dogberry2023 Coffee Wars George Trolls Band Together Biggie Voice role 2024 Here Leo
Television Year Title RoleNotes 2006 Spooks Policeman Episode: "The Message" 2009 The Inbetweeners Wolfie Episode: "Work Experience"2010 Doctor Who Marcellus Episode: "The Pandorica Opens" Peep Show Games Shop Assistant Episode: "Man Jam"2011 Doctors Barry Towers Episode: "The Nun's Tale" Life's Too Short Groom Episode: "Episode 2" Pete versus Life Manfred Series regular; 6 episodes Black Mirror Oliver Episode: "Fifteen Million Merits"2012 Game of Thrones Rennick Episode: "Garden of Bones" Parents Ed Episode: "Episode 2" Doubt on Loan Eddie Television film2013 Mayday James Spicer Miniseries; 5 episodes Big Bad World Oakley Series regular; 8 episodes2014 Sherlock Howard Shilcott Episode: "The Empty Hearse" The Job Lot Tyler Kerrigan Episode: "Workshop" 2014–2016 Undateable Brett Series regular; 36 episodes2015 Banana Bruce Bevis Episode: "Episode 2" The Sixth Lead Bartender Episode: "The Perfect Joke" 2017 Porn Again Terry Miniseries; 3 episodes 2018 Vanity Fair Jos Sedley Miniseries; 5 episodes 2018–2019 Trolls: The Beat Goes On! Biggie Recurring role; 43 episodes; Voice only2019 Whiskey Cavalier Todd Recurring role; 2 episodes Best Intentions Andy Banks Television film2020 Influential David Episode: "The IG Model - SexyKatie_Official" Madagascar: A Little Wild Sir Braxton Episode: "A Tale of Two Kitties"; Voice only 2020–2022 Trolls: TrollsTopia Biggie Recurring role; 14 episodes; Voice only2021 The Pembrokeshire Murders Jonathan Hill Miniseries; 3 episodes Short Circuit Episode: "No. 2 to Kettering"; Voice only2022 The Thief, His Wife and the Canoe David Leigh Miniseries; 2 episodes Am I Being Unreasonable? Alex Series regular; 6 episodes Avenue 5 Judd Series regular; 6 episodes 2023–2024 Not Quite Narwhal Cedric Recurring role; 4 episodes; Voice only2024 Belgravia: The Next Chapter Ross Series regular; 7 episodes Daddy Issues Derek Main Cast2025Lazarus Seth McGovern Main Cast
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