Stefan O was born in Trieste, a small town in Italy right on the border with the ex Yugoslavia.
At the end of the 80's, Stefan-o was involved in the underground acid house and techno scene working as a PR for top clubs such as Arena, Movida and La Scala and at the end of the 90's as the Resident DJ at NJoy Club in Trieste playing alongside the most respected italian artists such as Massimino Lippoli, Leo Mas, Fabrice, Claudio Dirocco, and Ralf.
In 2001 he moved to London. From there he played at clubs and festivals around Europe with peers such as Alex Smoke, Troy Pierce, Lawrence-sten, Pan Pot, Audio Werner, Cassy, Portable aka Bodycode, Margaret Dygas, Mark Henning, Jacek Sienkiewicz, Lakuti and many more.
In 2007 along with Cesare vs Disorder,Stefan O founded the record label..