Her research area is mathematics education with recent investigations focussed on cognitive aspects of knowing and learning the function concept. In addition, she has developed a broad framework for investigating students' mathematical methods and problem solving behaviors. An NSF CAREER Award is supporting her current development of concept assessment instruments for precalculus and beginning calculus. She teaches preservice secondary methods and content courses, graduate courses in research in undergraduate mathematics education, and recently led the development of two new Ph.D. programs in mathematics education at ASU. She is the Coordinator/President-Elect for the recently formed MAA Special Interest Group, Research in Undergraduate Mathematics Education, and has been active in various professional organizations, including PME, PME-NA, NCTM, MAA and ARUME.