At the time this article appeared, in 1976, the biographical note recorded that Joseph L. Sax was an ardent admirer of our national parks who spent much of his time hiking their trails. Based at the University of Michigan Law School, where he taught environmental law, he had studied park history, use, and administration. His writings and other work dealing with environmental laws had led in 1975 to the U.S. Environmental Protection Agency Environmental Quality Award. In 2006, having continued to teach environmental law, water law, public land law, and property rights for three more decades, Sax is House & Hurd Endowment Professor, emeritus, at the University of California, Berkeley. From 1994 to 1996 he served as Counselor to the U.S. Secretary of the Interior, where his areas of responsibility were property rights legislation, water rights, and implementation and reauthorization of the endangered species act. A graduate of Harvard College and the University of Chicago law school, he holds an honorary doctor of laws degree from the Illinois Institute of Technology and is the recipient of many honors, including the Elizabeth Haub Award given in Conjunction with the Free University of Brussels, the Environmental Law Institute Award, the Sierra Club William 0. Douglas Legal Achievement Award, and the National Wildlife Federation Resource Defense Award. Among his publications, Sax is the author of Defending the Environment (1970), Mountains without Handrails (1980), and Playing Darts with a Rembrandt (2000) and co-author of Legal Control of Water Resources (fourth edition forthcoming 2006).