He received his Ph.D. in mathematics education from Illinois State University, a masters degree in computer and educational technology from Marmara University, and a bachelors degree in mathematics education from Gazi University. Prior to his appointment at UW-Stevens Point, he had taught mathematics at the middle- and high-school levels, and university-level courses for prospective middle- and elementary-school teachers. His main research interests include the development of students' and teachers' algebraic reasoning, particularly in the elementary and middle grades, and the development of pre-service and in-service teachers' mathematical knowledge for teaching. He currently teaches elementary and middle-school mathematics pre-service teacher courses. His main research has been in the areas of algebra education and the history of school mathematics.