2008
Alice Dreger, professor of clinical medical humanities and bioethics, Feinberg School of Medicine, Northwestern University
"Body Modification and the Future of Normal"
2007
David Macaulay, author/architect
"Body Building and Other Architectural Journeys"
2006
Manjul Bhargava, professor of mathematics, Princeton University
"Drumming and Poetry: The Nature of Human Thought and the Origins of Mathematics"
2005
William Rathje, professor, Stanford University
"Garbology: The Archaeology of Us"
2004
Bill McKibben, author/social critic/environmentalist
"Technology: Invasion of the Soul?"
2003
Steven Wise, American legal scholar
"Consciousness: For Humans Only?" (animal consciousness)
John Holland, professor of electrical engineering and computer science, professor of psychology, University of Michigan
"Consciousness: For Humans Only?" (artificial intelligence)
2002
Patch Adams, physician, founder/director of the Gesundheit Institute
"Alternative Medicine"
2001
Robert D. Bullard, Ware Professor of Sociology, director of the Environmental Justice Resource Center, Clark Atlanta University
"Environmental Justice for All: The Politics of Pollution"
2000
Kristin Dawkins, vice president for international programs, Institute for Agriculture and Trade Policy (Minneapolis)
"Agriculture and Biotechnology: Battle Royal of the 21st Century"
Martha Crouch, professor of biology, Indiana University
"From Golden Rice to Terminator Technology: The Trouble with Biotechnology in Agriculture"