 United Nations Secretary-General Ban Ki-Moon appointed Hocking for two terms, first on 15 May 2009 and again on 15 May 2013, to head the Registry of the ICTY, a neutral organ of the Tribunal which provides legal, diplomatic and administrative support to Judges, Prosecution and Defence.He was appointed for a third term by Secretary-General António Guterres on 15 May 2017 to support the completion of the Tribunal's work until its closure on 31 December 2017.The United Nations Secretary-General Ban Ki-Moon also appointed Hocking on 18 January 2012 as the first Registrar of the Mechanism for International Criminal Tribunals and entrusted him with its effective start-up.