is Distinguished Professor of the Graduate Division at the University of California, Riverside. Winner of the 2009 Jack Block Award for Research in Personality, he is a former editor of the Journal of Research in Personality and is the author of The Personality Puzzle, a widely-used textbook. Best known for his research on personality judgment, he has also published research on delay of gratification, attribution theory, personality development, and the psychological assessment of situations. He is principal investigator of the International Situations Project, a collaboration of 144 psychologists from 64 countries. His research has been supported by grants from the National Institutes of Health and the National Science Foundation. Before arriving at UCR, he served on the faculty at Harvey Mudd College, Harvard University, and the University of Illinois, Urbana-Champaign.