Jose A. Amador is professor of soil science and microbial ecology at the University of Rhode Island. He received his B.S. degree (1982) in biochemistry, and M.S. (1986) and Ph.D. (1990) degrees in soil microbiology from Cornell University. Jose has been at the University of Rhode Island since 1992, where he teaches in the department of Natural Resources Science and the Honors Program. For the past six years, he has used the problem-based learning approach to teach courses in introductory soil science, soil microbiology, soil and water chemistry, and land use. His research focuses on the applications of soil ecology and microbiology to problems in nutrient cycling, wastewater disposal, bioremediation, and plant nutrition. Libby Miles is associate professor in the College Writing Program at the University of Rhode Island. She received her B.A. degree in theatre from Williams College (1986), and M.A. (1995) and Ph.D. (1999) degrees in rhetoric and composition from Purdue University. Libby has been at the University of Rhode Island since 1998, where she has taught in the college writing program, the English department's graduate program, and the honors program. She also directed the university's writing center. She has used problem-based learning in several of her writing classes, from Honors Writing for First-Year Students, to Business Communications to a graduate seminar in Rhetoric and Institutional Critique. Her current research interests are the economic and institutional conditions of writing and writing instruction, rhetoric as an agent of social change, and interdisciplinary writing. C.B. Peter is professor of sociology at the University of Rhode Island. He received his B.A. degree (1971) from Westmont College, and M.A. (1973) and Ph.D. (1977) degrees from the University of Kentucky. His scholarly expertise is in cultural sociology and the sociology of knowledge. In addition to his sociological books and articles, C.B. has published papers and presented workshops and seminars on teaching and instructional design. He has used problem-based learning units with first-year students in large enrollment sections of introductory sociology.