In 1959, Matthiessen published the first edition of
Wildlife in America, a history of the extinction and endangerment of animal and bird species as a consequence of human settlement, throughout North American history, and of the human effort to protect endangered species. In 1965, Matthiessen published
At Play in the Fields of the Lord, a novel about a group of American
missionaries and their encounter with a South American
indigenous tribe. The book was adapted into the
film of the same name in 1991. In 1968, he signed the "
Writers and Editors War Tax Protest" pledge, vowing to refuse tax payments in protest against the Vietnam War. His work on oceanographic research,
Blue Meridian, with photographer Peter A. Lake, documented the making of the film
Blue Water, White Death (1971), directed by
Peter Gimbel and Jim Lipscomb. Late in 1973, Matthiessen joined field biologist
George Schaller on an expedition in the
Himalaya Mountains, which was the basis for
The Snow Leopard (1978), his double award-winner. Interested in the
Wounded Knee Incident and the 1976 trial and conviction of
Leonard Peltier, an
American Indian Movement activist, Matthiessen wrote a non-fiction account,
In the Spirit of Crazy Horse (1983). In 2008, Matthiessen revisited his trilogy of Florida novels published during the 1990s:
Killing Mr. Watson (1990), ''Lost Man's River
(1997) and Bone by Bone
(1999), inspired by the frontier years of South Florida and the death of planter Edgar J. Watson shortly after the Southwest Florida Hurricane of 1910. He revised and edited the three books, which had originated as one 1,500-page manuscript, which eventually yielded the award-winning single-volume Shadow Country''. While Matthiessen is celebrated for his mastery of both fiction and non-fiction, he always considered himself first and foremost a writer of novels, saying, "Like anything that one makes well with one's own hands, writing good nonfiction prose can be profoundly satisfying. Yet after a day of arranging my research, my set of facts, I feel stale and drained, whereas I am energized by fiction. Deep in a novel, one scarcely knows what may surface next, let alone where it comes from. In abandoning oneself to the free creation of something never beheld on earth, one feels almost delirious with a strange joy." ==
Crazy Horse lawsuits==