Leo Eitinger (1912-1996) was a Czech-born Norwegian psychiatrist and Holocaust survivor whose work significantly advanced the understanding of trauma and post-traumatic stress disorder (PTSD). Born in Lomnice, Czechoslovakia, Eitinger pursued medical studies in Brno before fleeing the Nazi regime to Norway in 1939. During World War II, he was arrested and deported to Auschwitz and later Buchenwald, where he survived until liberation in 1945. After the war, Eitinger returned to Norway, where he completed his medical degree and began a distinguished career in psychiatry. He became a professor at the University of Oslo and was instrumental in pioneering research on the psychological effects of war and persecution. Eitinger's studies on Holocaust survivors and refugees provided critical insights into PTSD, influencing both clinical practice and public policy. His work earned him numerous accolades, and he was a vocal advocate for human rights. Eitinger's legacy endures in the fields of psychiatry and trauma studies, highlighting the enduring impact of his research and advocacy.