Glenn Adelson teaches biology and environmental studies at Wellesley College and is coauthor of "Biodiversity: Exploring Values and Priorities in Conservation," James Engell is chair, English and American literature and language, and faculty member of the Harvard University Center for the Environment. Brent Ranalli is senior analyst at The Cadmus Group, Inc., an employee-owned environmental consulting firm. K. P. Van Anglen teaches English at Boston University and helps edit the Princeton Thoreau Edition.