Aldo Leopold

An American ecologist, forester, and environmentalist; considered by many to be the father of wildlife management and of the United States’ wilderness system.

Leopold wrote A Sand County Almanac which has been read by millions and has informed and spurred the environmental movement and a widespread interest in ecology as a science. Published shortly after Leopold's death in 1949, A Sand County Almanac is a combination of natural history, scene painting with words, and philosophy. It is perhaps best known for the following quote concerning ecological ethics: "A thing is right when it tends to preserve the integrity, stability, and beauty of the biotic community."

See also:
Aldo Leopold Foundation
Yale School of Forestry