Originally from Belfast,[1][2] he later moved to England, where he studied at Oxford University on biochemistry specialty[3] and worked as a research scientist.
[6] Doak and video game composer Graeme Norgate left Rare in 1998[7] to start Free Radical Design.
[3] On 19 May 2021, Deep Silver announced the reformation of Free Radical Design with David Doak and Steve Ellis as studio heads to make a new TimeSplitters game.
[14] On 11 December 2023, the reformed Free Radical Design was closed down, and the new TimeSplitters game has been cancelled as a result.
Doak listed Defender's arcade version, Laser Squad on the ZX Spectrum, The Legend of Zelda: Link's Awakening, The Legend of Zelda: A Link to the Past, Missile Command's arcade version, Monkey Island 2: LeChuck's Revenge, Peter Pack Rat's arcade version, The Secret of Monkey Island, Space Duel, Super Bomberman, Super Mario Kart, and XPilot as his favorite games in 2000.