He is currently serving as the Program Director for Developmental and Learning Sciences at the National Science Foundation. He studies the perception and action control of both infants and adults. He received his B.A. in Psychology and Computer Science from Swarthmore College in 1991 and his Ph.D. in Psychology and Cognitive Science from Cornell University in 1996. He has published articles in many of the top journals in his field, including Psychological Science, Science, Experimental Brain Research, Teaching of Psychology, and the Journal of Experimental Child Psychology. He is also the creator of the DVD What Babies Can Do: An Activity-Based Guide to Infant Development.