Born in Salt Lake City, Utah (USA) in 1946, he graduated from Colorado College with a degree in political science. From 1970 to 1972, he covered the Vietnam War as a freelancer for the American magazines Time and Life. He joined the Gamma agency in 1973, photographing the aftermath of the military coup in Chile and sharing with Raymond Depardon and Chas Gerretsen the Robert Capa Gold Medal awarded by the Overseas Press Club of America (OPC) for their book Chili. For fifty years, he has produced reports from 80 countries, and since 1984 has covered ten summer and three winter Olympic Games. His images have been exhibited at the Rencontres d'Arles, the Perpignan and Pingyao festivals, and in museums, galleries and cultural institutions in Europe, Australia, Japan, China and the United States. He is the recipient of numerous awards, including the Philippe Halsman Award for his contribution to photojournalism, presented by the American Society of Media Photographers (ASMP) in 1986, and the Sprague Award for lifetime achievement, presented by the National Press Photographers Association (NPPA) in 2018. He co-founded the agency Contact Press Images with Robert Pledge in 1976, in New York.