W. Gary Martin is Emily R. and Gerald S. Leischuck Endowed Professor in the Department of Curriculum and Teaching at Auburn University, where he teaches undergraduate and graduate courses in mathematics education and serves as co-director of the Mathematics Teacher Education Partnership (www.MTE-Partnership.org), a national coalition of universities seeking to improve the preparation of secondary mathematics teachers. He has been a writer on multiple standards documents, including Principles and Standards for School Mathematics (National Council of Teachers of Mathematics [NCTM], 2000), Focus in High School Mathematics: Reasoning and Sense Making (NCTM, 2009), and Principles to Actions: Ensuring Mathematical Success for All (NCTM, 2014). Most recently, he was the lead writer for high school on the Standards for Preparing Teachers of Mathematics (Association of Mathematics Teacher Educators, 2017). He has presented extensively on mathematics education, particularly the teaching and learning of geometry, mathematics curriculum and standards, and mathematics teacher preparation. Previously, Martin served as the director of research for NCTM and has also held positions at the University of Hawai?i and Northern Illinois University. He began his career as a high school mathematics teacher, a role that remains central to his professional identity.