(April 3, 1837-March 29, 1921) an American naturalist and essayist important in the evolution of the U.S. conservation movement. According to biographers at the American Memory project at the Library of Congress, John Burroughs was the most important practitioner after Thoreau of that especially American literary genre, the nature essay.

(September 9, 1868–August 13, 1934) a prolific novelist, poet, critic, and playwright, as well as an early feminist and defender of Native American and Spanish-American rights. She is best known for her tribute to the deserts of the American Southwest, The Land of Little Rain.

(January 11, 1887 - April 21, 1948) a United States ecologist, forester, and environmentalist. He was influential in the development of modern environmental ethics and in the movement for wilderness preservation. Aldo Leopold is considered to be the father of wildlife management in the United States.

(January 9, 1890 – December 25, 1938) was one of the most influential Czech writers of the 20th century, and a Nobel Prize nominee (1936). He introduced and made popular the word 'robot', which first appeared in his play R.U.R. (Rossum's Universal Robots) in 1921.

(1902 – 1968) In 1940, John Steinbeck, and his biologist friend Ed Rickets, embarked on a 4,000-mile trip to the Sea of Cortez that combined the scientific collection and observation of marine life with high adventure, philosophy, ethics and art.

Sacks (b. 1933) is a United States-based British neurologist who has written popular books about his patients.

(born January 6, 1945) an American essayist, poet, fiction writer and prose stylist whose work is best known for its ecological concerns. Lopez has been described as “the nation’s premier nature writer” by the San Francisco Chronicle.