He had the important role of producing Björk's 1997 album Homogenic, a collaboration that continues to the present day. He was involved in her tours in 1998 and the 2007–2008 tour for her album Volta. Bell can be seen on several of Björk's live music DVDs released for her DVD box set running a complicated rack of equipment that produces the sequencing required for Björk to perform her music live. He also appears, suspended in mid-air, in the video for her single Declare Independence. He has contributed numerous remixes to her singles and compilations as well as remixing the likes of Depeche Mode and Dave Clarke.
He has also recorded under the aliases Clark, Clark & Lofthouse, Counterpoint, Fawn, and Speed Jack.