Paul LockhartPaul Lockhart dropped out of college after one semester to devote himself exclusively to math. Based on his own research he was admitted to Columbia University where he received his PhD. The author of Arithmetic, Measurement, and A Mathematician's Laent, he has taught mathematics at Brown University, University of California, Santa Cruz, and to K-12 level students at St. Ann's School in Brooklyn, New York. Read More Read Less