He witnessed genocides in Rwanda, Bosnia-Hercegovina and Darfur, the latter while being the head of the United Nations in Sudan. He lost his job after becoming a whistleblower regarding UN inaction in Darfur.
During his time witnessing genocides in Rwanda, Bosnia-Hercegovina, and Darfur, he served as the head of the United Nations in Sudan.  He was fired for exposing the UN's lack of action in Darfur.