Craig E. Nelson is Professor Emeritus of Biology at Indiana University in Bloomington, where he has been since 1966. His biological research (60+ articles and chapters) has been on evolution and ecology, most recently on sex-determination in turtles. His articles on teaching (20+) address critical thinking and mature valuing, diversity, active learning, teaching evolution and the scholarship of teaching and learning. He has presented invited workshops these and related topics at numerous national meetings and at many individual institutions (in 36 states, Puerto Rico, Canada, Denmark, Iceland, Ireland, England, Australia and South Africa).