I am a Professor of Mathematics and Director of Mathematics Education at St. Olaf College. I am a former high school teacher in the Greater Boston area. After completing my Ph.D. in number theory at Boston University, I held a post-doctoral position at the BU School of Education, focusing on teacher preparation and mathematics education research.

I am the North American Director of Budapest Semesters in Mathematics Education, a study abroad program emphasizing the problem-solving approach to learning and teaching. I was a Principal Investigator for the NSF-funded Assessing Secondary Teachers’ Algebraic Habits of Mind, a research project that investigated the relationships between teachers’ own mathematical habits of mind, their use of such habits in teaching practice, and student achievement.