Charles A. S. Hall (born 1943) is an American systems ecologist and ESF Foundation Distinguished Professor at State University of New York in the College of Environmental Science & Forestry.
His work has involved streams, estuaries and tropical forests but focused increasingly on human-dominated ecosystems in the US and Latin America.
His research reflects his interest in understanding and developing analyses and computer simulation models of the complex systems of nature and humans and their interactions.
Hall, and other biophysical economic thinkers are trained in ecology and evolutionary biology, fields that break down the natural world as done also by physicists.
[5] Nicholas Georgescu-Roegen (a Romanian-born economist whose work in the 1970s began to define this new approach) models the economy as a living system.