Organizations: Robert Underwood Ayres (June 29, 1932 – October 23, 2023) was an American-born physicist and economist.

[2] Trained as a physicist at the University of Chicago, University of Maryland, and King's College London (PhD in Mathematical Physics), Ayres dedicated his professional life to advancing the environment, technology and resource end of the sustainability agenda.

His major research interests included technological change, environmental economics, "industrial metabolism" and "eco-restructuring".

He worked at the Hudson Institute (1962–67), Resources for the Future Inc (1968) and International Research and Technology Corp (1969–76).

From 1979 until 1992 he was Professor of Engineering and Public Policy at Carnegie Mellon University, Pittsburgh, Pennsylvania, except for two years (and six summers) on leave at the International Institute for Applied Systems Analysis (IIASA) in Laxenburg Austria.

In 1992 he moved to the international business school INSEAD in Fontainebleau, France as Sandoz (later Novartis) Professor of Environment and Management.