Throughout the mid-1990s he was a member of the trio Thela with Rosy Parlane and Dean Roberts.
Mattin has collaborated with other artists including; Dion Workman, Taku Unami, Emma Hedditch, Margarida Garcia, Xabier Erkizia, Karin Schneider, Oren Ambarchi, Dean Roberts, Bruce Russell, Campbell Kneale, Tony Conrad, Taku Sugimoto, Matthew Bower, Philip Best, Drunkdriver, Ray Brassier and Junko.
Dean Martin | Dean | Julia Roberts | James Dean | Howard Dean | dean | Dean (education) | Frederick Roberts, 1st Earl Roberts | Forest of Dean | Eric Roberts | Dean (religion) | Dean Koontz | William Dean Howells | Dean Rusk | John Dean | Jimmy Dean | Elton Dean | Dean (Christianity) | Dean Cain | Oral Roberts | John Roberts | Dizzy Dean | Dean Smith | Oral Roberts University | Hazell Dean | Dean Stockwell | Dean Kamen | Chris Roberts | Tom Roberts | Rural Dean |
Martin eventually declined to join on a full-time basis and lone survivors, Geoff Gayer and Dean Roberts, started the search anew and were finally introduced to Florida-based screamer Wade Black (Crimson Glory, Leash Law, Seven Witches).