John D Greenwood was educated at the Universities of Edinburgh and Oxford, and teaches in the departments of philosophy and psychology at City College and the Graduate Center, City University of New York. His many books and articles include "Explanation and Experiment in Social Psychological Science" (Springer-Verlag, 1989), "Realism, Identity and Emotion "(Sage, 1994) and "The Disappearance of the Social in American Social Psychology "(Cambridge University Press, 2004).