Sierra Club directors

Ansel Easton Adams was an American landscape photographer and environmentalist known for his black-and-white images of the American West. He helped found Group f/64, an association of photographers advocating "pure" photography which favored sharp focus and the use of the full tonal range of a photograph. He and Fred Archer developed a system of image-making called the Zone System, a method of achieving a desired final print through a technical understanding of how the tonal range of an image is the result of choices made in exposure, negative development, and printing.

American ichthyologist and educator (1851-1931)

Canadian environmental activist

American historian, writer, and environmentalist (1909-1993)

US Supreme Court justice from 1939 to 1975

American geologist (1823–1901)

British-American geodesist and astronomer (1825–1911)

American photographer (1901-1990)

American meteorologist (1863-1943)

Secretary of State of Wisconsin

American environmentalist

American conservation biologist

American mountain climber (1912–2016)