Mark is a Professor in the College of Education at California State University, Fullerton. Prior to entering higher education, Mark taught mathematics in grades 6-12 in northern California public schools for six years and experienced firsthand the power of creating learning environments in which students are supported in making sense of mathematics through collaborative inquiry and culturally relevant lessons. He earned National Board Certification in Early Adolescence Mathematics in 1999 and renewed his certification for the second time in 2019. While earning a Ph.D. in Education from the University of North Carolina Chapel Hill in 2005 with an emphasis on mathematics teacher education under the advisement and mentorship of Dr. Carol E. Malloy, Mark developed scholarly interests in the history of school mathematics in the U.S., equity in mathematics education, and middle school mathematics teaching and learning. He has taught future and current teachers of mathematics since 2003 including content and methods courses at the undergraduate and graduate levels. All his work is driven by a belief that every student has the potential to be successful in learning mathematics and a commitment to ensuring this potential is fulfilled in every classroom. Mark has published over 40 articles and made over 80 presentations about mathematics teaching and learning for both practitioners and teacher educators. Putting research into practice, he has received over $9 million in competitive grant funding to support collaborative work with teachers of mathematics from elementary through high school aimed at understanding how to create learning environments that support all students in making sense of mathematics.