Peter Matthiessen is a two-time National Book Award-winning American novelist and nonfiction writer as well as an environmental activist. He frequently focuses on American Indian issues and history, as in his detailed study of the Leonard Peltier case, In the Spirit of Crazy Horse. In November 2008, at age 81, he received his second National Book Award for Shadow Country, an 890-page revision of a trilogy of novels he released in the 1990s. His first National Book Award was won in 1980 for The Snow Leopard. His story Travelin' Man was adapted into the film The Young One by Luis Buñuel.