Daniel L. Worthen received his PhD in experimental psychology from Colorado State University in 2000. His areas of expertise include the psychology of learning, animal cognition and behavior, the history of psychology, and evolutionary psychology. He is an associate professor of psychology at California State University, Chico, and lives in Chico, California.

Books related to this author:

Altruistic Species, The Andrew Michael Flescher and Daniel L. Worthen