Cian McCann began his drum-and-bass career in Dublin, working with the Bassbin label, and made his first release in 1999. He initially recorded as Zero Tolerance before becoming known as Zero T. His early work included tracks released through Bassbin, and his later collaborations brought him together with Calibre, 4 Hero, Klute, Alix Perez, Icicle and Noisia. McCann is based in London. A 2008 album, Cheap Shots, came out on CIA Records; its lead track, “Walk Away”, featured Steo.
In 2010, Zero T curated and mixed FABRICLIVE052. His 2015 album Golden Section followed, adding to a run of releases connected with Metalheadz, Shogun Audio, The North Quarter and Integral Records. McCann has also collaborated with Alix Perez on “Refusal / Dangerous Liaison”, released as a single on Integral Records in 2007. In an interview about launching his Footprints label, McCann discussed working under the name Zero T. His work as Zero T has also included collaborations with Calibre and with Beta 2 and Mentality.