Ron Ritchhart is research associate at Project Zero, Harvard Graduate School of Education, where he has worked on a number of projects focusing on the development of thinking, understanding, and creativity in schools. He is a recipient of the Presidential Award for Excellence in Teaching Mathematics and of the 1999-2000 Spencer Dissertation Fellowship. Ritchhart is author of several books, including Making Numbers Make Sense, Through Mathematical Eyes, and Pythagora’s Bow Tie. He is coauthor and coproducer of the Creative Classroom Series.