Developmental geneticist and theoretical biologist Stuart A. Kauffman MD lectured in the Villard Room on "Investigations: The Physical Nature of Autonomous Agents May Answer the Question 'What is the Meaning of Life?'"  A former professor of biochemistry and biophysics at the University of Pennsylvania and a MacArthur Fellow from 1987 until 1993, Dr. Kauffman gained prominence for his work in evolutionary biology on the origins of life. He was the author of Origins of Order: Self-Organization and Selection in Evolution (1993) and At Home in the Universe: The Search for Laws of Self-Organization and Complexity (1995).  His Investigations appeared from Oxford University Press in 2000.