Margaret Schwan Smith is a Professor in the Department of Instruction and Learning in the School of Education and a Research Scientist at the Learning Research and Development Center, both at the University of Pittsburgh. She works with pre-service mathematics teachers at the University of Pittsburgh, with doctoral students in mathematics education who are interested in becoming teacher educators, and with practicing mathematics teachers and coaches locally and nationally. Over the past decade, she has been developing research-based materials for use in the professional development of mathematics teachers and studying what teachers learn from the professional development in which they engage. She is currently the director of the NSF-funded CORP project, which is developing materials focused on reasoning and proving for mathematics teachers’ professional development. She is a member of the Board of Directors of the National Council of Teachers of Mathematics (2006–2009). In 2006, she was selected to receive the Chancellor’s Distinguished Teaching Award given annually to honor outstanding faculty at the University of Pittsburgh.