He worked with the company Mutato Muzika from 1992-2006 and has been working freelance since 2007. In his 15+ year career as a composer, he has two Emmy nominations for the music he composed for the TV series Clifford the Red Dog. He has also done music for the following games; Crash Bandicoot, Crash Bandicoot 2: Cortex Strikes Back, Crash Bandicoot: Warped, Crash Team Racing, Interstate '82, Johnny Mnemonic: The Interactive Movie, Jak & Daxter, Jak II: Renegade and Jak3. Mancell also composed the music for the following films: Bongwater (1998), Love Comes to the Executioner (2006) and The Lights (2007).