Dr. J. Emil Morhardt is Roberts Professor of Biology at Claremont McKenna, Scripps, and Pitzer Colleges, members of the Claremont Colleges, in Southern California where he teaches courses related to the topics of this book. Prior to returning to academia in 1996, for nearly two decades he was Senior Vice President and Director of Western Operations for EA Engineering, Science, and Technology, Inc., a national consulting firm serving electric and water utilities, government agencies such as the National Park Service, the US Fish and Wildlife Service, and the US Environmental Protection Agency,