Robert Siegler is the Teresa Heinz Professor of Cognitive Psychology at Carnegie Mellon University. He is the author of the cognitive development textbook Children's Thinking and has written or edited several additional books on child development. His books have been translated into Japanese, Korean, Spanish, French, and Portuguese. In the past few years, he has presented keynote addresses at the conventions of the Cognitive Development Society, the International Society for the Study of Behavioral Development, the Japanese Psychological Association, the Eastern Psychological Association, and the Conference on Human Development. He also served as Associate Editor of the journal Developmental Psychology, co-edited the cognitive development volume of the 2006 Handbook of Child Psychology, and served on the National Mathematics Advisory Panel from 2006-2008. In 2005, Dr. Siegler received the American Psychological Association's Distinguished Scientific Contribution Award.