Robert A. Herendeen (1940-), an American physicist, helped pioneer the application of input-output analysis to the analysis of energy in economic systems in 1975. With Clark Bullard and Bruce Hannon at the University of Illinois, he adapted the input-output methods developed by Leontief to the flows of energy between sectors in the U.S. economy. This work was among the most detailed quantitative analysis of the energy required to produce goods and services. The work of Herendeen and his colleagues generated new insight into the energy balance of trade, the connection between energy use and employment, the energy cost of recycling, the energy impacts of alternative transportation options, and the energy implications of alternative household consumption patterns.

Further Reading
Input-Output Analysis-The Basics (Community Policy Analysis Center at the University of Missouri)

Robert A. Herendeen (1940-), an American physicist, helped pioneer the application of input-output analysis to the analysis of energy in economic systems in 1975. With Clark Bullard and Bruce Hannon at the University of Illinois, he adapted the input-output methods developed by Leontief to the flows of energy between sectors in the U.S. economy. This work was among the most detailed quantitative analysis of the energy required to produce goods and services. The work of Herendeen and his colleagues generated new insight into the energy balance of trade, the connection between energy use and employment, the energy cost of recycling, the energy impacts of alternative transportation options, and the energy implications of alternative household consumption patterns.

Further Reading
Input-Output Analysis-The Basics (Community Policy Analysis Center at the University of Missouri)