David Barash is an evolutionary biologist, peace activist, and Emeritus Professor of Psychology at the University of Washington. His research focuses on understanding the underlying evolutionary factors influencing human behavior. He has written many books, most recently Through a Glass Brightly: Using Science to See Our Species as We Really Are and Strength Through Peace: Happiness and Demilitarization in Costa Rica, and What the World Can Learn from a Tiny Central American Country (with Judith Lipton). He holds a PhD in zoology from the University of Wisconsin-Madison.