Raymond Fredric Dasmann (May 27, 1919 – November 5, 2002) was an American biologist and environmental conservationist whose works were formative to the field of environmental science. Among other achievements, he helped develop the idea of sustainable development and wrote an influential textbook, Environmental Conservation, first published in 1959; it was in its fifth edition at the time of Dasmann's death in 2002. Source: Wikipedia (en)