Thomas E. Graedel is Clifton R. Musser Professor of Industrial Ecology, Professor of Chemical Engineering, Professor of Geology and Geophysics, and Director of the Center for Industrial Ecology at Yale University. He is the author of Streamlined Life-Cycle Assessment and lead author or coauthor of a number of other books.

Ester van der Voet is Associate Professor of Industrial Ecology in the Institute for Environmental Sciences at the University of Leiden. She is the coeditor of Heavy Metals: A Problem Solved?.