Prior to his appointment to the ICC, he had an extensive legal career in Italy as a prosecutor, including holding the office of Chief Public Prosecutor.
Judge of the International Criminal Court, 2009-present
Tarfusser was appointed to his position on the ICC on 11 March 2009 He is assigned to Pre-Trial Chamber II at the International Criminal Court.
In October 2013, Tarfusser issued an arrest warrant for Kenyan journalist Walter Barasa on suspicion of attempting to bribe a potential witness in the International Criminal Court investigation in Kenya against Ruto; this was the first time the court sought to prosecute someone over interfering with its legal process.