Caren L DiefenderferCaren L. Diefenderfer (AB Dartmouth College, MA, Ph.D. University of California at Santa Barbara) is Professor of Mathematics at Hollins University. Caren has been active with the AP Calculus Program for over 20 years and served as Chief Reader for A Calculus from 2004-2007. She has been a leader with MAA efforts on Quantitative Reasoning and is currently the Chair of the MAA's Special Interest Group for the Teaching of Advanced High School Mathematics (SIGMAA TAHSM). Read More Read Less