Robert M. Sapolsky is a Professor of Biology & Neurology at Stanford & a Research Associate with the Institute of Primate Research, National Museums of Kenya. He is the author of "The Trouble with Testosterone" & "Why Zebras Don't Get Ulcers", both Los Angeles Times Book Award finalists. A regular contributor to Discover & The Sciences & a recipient of a MacArthur Foundation genius grant, Sapolsky lives in San Francisco, California.