He has researched and published extensively on state-society relations, human rights, religion, and politics in Burundi, Rwanda, and the Democratic Republic of Congo, and authored the book Christianity and Genocide in Rwanda. Prior to coming to Boston University, he taught for 13 years at Vassar College. He has served as a consultant for Human Rights Watch, the International Center for Transitional Justice, and USAID in Burundi, Rwanda, and Congo. He served as an East Africa analyst for Freedom in the World.