Christopher Browning is an American historian known for his work on the Holocaust and World War II. He is particularly recognized for his book, "Ordinary Men," which examines the actions of a police battalion involved in the mass murder of Jews during the Holocaust. His research focuses on the social and psychological factors that led ordinary individuals to commit atrocities. Browning has contributed significantly to the understanding of the Holocaust through his analysis of the behavior of perpetrators. He has also written extensively on topics related to Nazi Germany, anti-Semitism, and the moral implications of historical events, making him a prominent figure in Holocaust studies.