As High Commissioner, Guterres headed one of the world's largest humanitarian organizations, which at the end of his term had more than 10,000 staff working in 126 countries providing protection and assistance to over 60 million refugees, returnees, internally displaced people and stateless persons. His time in office was marked by a fundamental organizational reform, cutting staff and administrative costs in the UNHCR's Geneva head office and expanding UNHCR's emergency response capacity during the worst displacement crisis since the Second World War.