Bruce Lerro has taught for 23 years as an adjunct professor of psychology at Dominican University, Golden Gate University, and Diablo Valley College. He is the author of two books about early human societies: From Earthspirits to Sky-Gods: The Socio-Ecological Origins of Monotheism, Individualism, and Hyper-Abstract Reasoning and Power in Eden: The Emergence of Gender Hierarchies in the Ancient World.