S. A. Klein is Emeritus Professor of Mechanical Engineering at the University of Wisconsin, Madison. He is the recipient of the American Society for Mechanical Engineers (ASME) James Harry Potter Gold Medal (2013), the Pi Tau Sigma Distinguished Professor of Mechanical Engineering Award (1991, 1992), and the Polygon Engineering Council Outstanding Professor of Mechanical Engineering Award (1991, 1992). He is a Fellow of ASME, the American Society of Heating, Refrigeration, and Air-Conditioning Engineers (ASHRAE), the American Solar Energy Society (ASES), and the International Building Performance Simulation Association (IBPSA).