Kristen Malzahn is a Senior Researcher at Horizon Research, Inc. in Chapel Hill, NC and a co-Principal Investigator in Project AIM. She began her career as an elementary school teacher and went on to receive a M. Ed. in Curriculum and Instruction at the University of North Carolina at Greensboro. Over the past two decades, she has worked on several mathematics education research and evaluation projects and published a number of journal articles and book chapters, many of which focused on mathematics professional development for elementary and middle grades teachers. Understanding the successes and challenges of teaching, she is most interested in supporting teachers as they work to provide effective mathematics instruction for each and every student.