Usiskin's doctoral dissertation in mathematical education at the University of Michigan involved the field testing of his book, Geometry: A Transformation Approach, which was written with Arthur Coxford. This book has greatly influenced the way geometry is taught in many American high schools, according to the NCTM citation.
Usiskin's Ph.D. research in mathematical education at the University of Michigan focused on testing his book, Geometry: A Transformation Approach, a collaborative work with Arthur Coxford. The book has had a profound effect on how geometry is taught in many American high schools, according to the NCTM.