Stephen B. Klein (Phd, Psychology, Rutgers University) is a Professor of the Department of Psychology at Mississippi State University, where he has taught since 1990. He teaches a variety of undergraduate classes, including Learning Principles and Processes, Human Learning and Thinking, Theories of Learning, and Quantitative Methods, as well as graduate classes in Advanced Learning, Advanced Learning and Motivation, and Advanced Experimental Methods. His research interests are in the biological basis of learning and memory and constraints and predispositions on food preferences and aversions. His early research included investigations of aversive conditioning and flavor aversion learning. Klein has written and co-edited a number of textbooks, including Contemporary Learning Theories: Pavlovian Conditioning and the Status of Traditional Learning Theory ; Handbook of Contemporary Learning Theories ; and Biological Psychology , Second Edition.