Mark Ryan

Mark Ryan is the creator and proprietor of The Math Center, a Winnetka, Illinois-based math and test prep tutoring institution. He is the author of the For Dummies publications Calculus Workbook For Dummies, Calculus Fundamentals For Dummies, and three books on geometry. Since 1989, Ryan has been teaching junior high and high school math. He currently resides in Evanston, Illinois.