Sasha Fajerstein is a math teacher at New Trier High School in Winnetka, Illinois—one of the highest ranked secondary schools in the nation. This pioneering mathematics educator, who is passionate about integrating new teaching methods and technologies into the classroom, recently collaborated with her colleagues at New Trier to develop and pilot an interactive high school geometry textbook for the iPad. She co-presented a talk about the iPad textbook project at the 2015 Illinois Council of Teachers of Mathematics Conference and also shared her insights into math education as a presenter at the Metropolitan Mathematics Club of Chicago. After earning her B.S. in mathematics from the University of Illinois at Urbana-Champaign, Sasha spent a year teaching English in Costa Rica. Upon returning to the U.S., she served as a math teacher at Nichols Middle School in Evanston, Illinois.