Dr. Zbiek is a former Pennsylvania mathematics and computer science teacher. She joined the Penn State faculty in 2002 after teaching mathematics and mathematics education at the University of Iowa for a decade. Her scholarly interests focus on teachers' and students' mathematical reasoning and representations in technology-intensive environments at the secondary and college levels. Her recent work includes theory-building research in the area of representation and models of mathematics teachers' incorporation of technology in classroom practice. She is the series editor for the National Council of Teachers of Mathematics Essential Understanding project.