Bruce E. Logan, PHD, is the Stan and Flora Kappe Professor of EnvironmentalEngineering at Penn State University, and Director of Penn State's Hydrogen Energy (H2E) Center and the Engineering Environmental Institute. Dr. Logan's areas of expertise include bioenergy (microbial fuel cells and biohydrogen production),bacterial adhesion, colloid transport, and bioremediation. He is the author or coauthor of over 200 refereed publications and books on environmental transport processes, microbial fuel cells, and perchlorate reduction.