I’m a math educator at the Math Forum, which is part of NCTM.  “Math educator” is a purposefully open-ended label.  I write problems and supporting materials for our Problems of the Week, observe, mentor, coach, and develop PD for teachers in grades K-12, tweet as @MFAnnie, speak at conferences and workshops, and ride my bicycle to work as often as I can. I occasionally teach Problem Solving in Geometry and Measurement in Grades 3-8 as part of the Math Forum’s online PD program, and I developed and used to teach two electives in Drexel’s Mathematics Learning and Teaching Master’s program (Teaching Math with the Geometer’s Sketchpad and Learning and Teaching Calculus with the Geometer’s Sketchpad).