Herbert L. Petri is a Professor at Towson University, where he has been recognized on five separate occasions for his excellent teaching. He also serves as Adjunct Professor of Psychology at Johns Hopkins University, teaching the Motivation course since 1986. Dr. Petri has studied the role of physiological, behavioral, and cognitive mechanisms of motivation, memory, and learning for more than 35 years. His research has led to published articles on the underlying circuitry of memory, drug actions on learning and memory, and reviews of motivational processes. He received his B.A. degree from Miami University, Oxford, Ohio and M.A. and Ph.D. degrees from Johns Hopkins University.