Roger B. NelsenRoger Nelsen received his BA in mathematics from DePauw University in 1964 and his PhD in mathematics from Duke University in 1969. He taught mathematics and statistics at Lewis and Clark College for forty years before his retirement in 2009. Nelsen as had a long affiliation with the AP Calculus program. He has participated in the annual summer AP readings for over twenty-five years, most of these in AP Calculus, with a stint in AP Statistics. For much of that time, he served as a Table Leader, and more recently as a member of a question team, responsible for working out the details of scoring a particular free-response question. Nelsen is the author or co-author of seven MAA books: Proofs without Words, Proofs without Words II, Math Made Visual, When Less Is More, The Calculus Collection, Charming Proofs and Icons of Mathematics. Read More Read Less