Building Powerful Cohorts

The M.A.T.M. community is comprised of a diverse group of educators from around the world who are committed to the learning and teaching of mathematics.


Michael Flynn

Director, Mathematics Leadership Programs

Mike Flynn is the Director of Math Programs in the Professional and Graduate Education Division. In this capacity he runs the Master of Arts in Teaching Mathematics program, oversees all the programming for the department, and develops new innovative ways to make the work of Mathematics Leadership Programs more accessible to teachers.

Michael Flynn, Visiting Instructor in Psychology & Education; Director, Mathematics Leadership Program

Sarah Bent

Assistant Director, Mathematics Leadership Programs

Sarah Bent is the Assistant Director of Math Programs in the Professional and Graduate Education Division. In this capacity, she oversees the Master of Arts in Teaching Mathematics program and supports the professional learning programs for K-8 math teachers locally and nationally.

Sarah Bent, Assistant Director of the Mathematics Education programs


Virginia Bastable


Virginia Bastable is one of the authors of the Developing Mathematical Ideas professional development curriculum published and two books on mathematical reasoning about the operations.

Photo of Virginia Bastable

Beth Brady


Beth Brady has taught in Northampton, Massachusetts since 1992, teaching first and second grades prior to becoming a Math Interventionist for children in grades K-3 in 2016. She works with the district's elementary teachers to incorporate Math Recovery into the mathematics curriculum. She was the 2016-2018 recipient of NCTM’s Mathematics Education Trust Program of Mathematics Study & Active Professionalism Grant which afforded her the opportunity to receive her second masters in Mathematics Teaching from Mount Holyoke College in 2018.

Beth Brady

Zak Champagne


Zak Champagne taught Grades 3-6 students in Jacksonville for 13 years. He also worked for six years as an Assistant in Research at FCR-STEM at Florida State University. He is currently the Director of Teacher Leadership at the Jacksonville Public Education Fund.

Photo of Zak Champagne

Yi Law Chan


Yi Law Chan is an instruction lead of elementary mathematics in New York City, where she facilitates professional learning for teachers, school and instructional leaders.

Photo of Yi Law Chan

Amy Chang


Amy Chang began her career in education as an elementary classroom teacher in grades 3 & 4 in Amherst, Massachusetts in 2000.  For the past seven years, Chang has served as the building math coach at Fort River Elementary School in Amherst, working with teachers K-6 to improve math instruction through practices that support early numeracy, differentiation, and student reasoning. She became a Math Recovery Champion in 2016 and was awarded Excellence Grants from the Amherst Education Foundation in 2016 and 2017 to train K-12 teachers in Math Recovery in the Amherst Regional School District.

Photo of Amy Chang

Stephanie Charbonnet


Stephanie Charbonnet is a mathematics specialist at Freedom Preparatory Academy in Memphis, Tennessee, where she also designs and leads professional learning and develops and implements curriculum and assessment for K-5 teachers.

Photo of Stephanie Charbonnet

Heidi Fessenden


Heidi Fessenden taught grades 1-4 for 15 years in the Boston Public Schools. She is currently the district elementary math coach in Cambridge, MA, where she works with teachers, coaches, and district staff as they make math teaching more joyful, collaborative, and antiracist.

Heidi Fessenden

Andrew Gael


Andrew Gael teaches math at the Cooke Center Academy, a school for students with disabilities in lower Manhattan, New York. He is also working with Illustrative Mathematics to create accessibility for students with disabilities to the Open Up Resources middle school mathematics curriculum

Photo of Andrew Gael

Marta Garcia


Marta Garcia is a mathematics education independent consultant in North Carolina and formerly a district  elementary mathematics specialist in Asheville schools. She taught at the elementary school level for 28 years and has taught math methods courses for pre-service teachers at a local university.

Photo of Marta Garcia

James Hanson MAT’16


Jim Hanson is currently a K-5 Math Coach for Northampton Public Schools. His coaching responsibilities include co-teaching and co-planning rigorous lessons, as well as leading math department meetings and providing regular, in-district professional development.

Photo of James Hanson

Shauna Hedgepeth


Shauna Hedgepath has taught middle school, high school, and has served as a district math coach and curriculum specialist. She currently works with secondary teachers across Mississippi, specializing in Algebra 1 curriculum and instruction.

Photo of Shauna Hedgepath

Mary Keller


Trish Kepler


Trish Kepler is a mathematics specialist and coordinator at Greenwich Country Day School in CT and part of team that synchronizes and implements K-5 mathematics curriculum, assessment, and instruction and customizes student support resources to foster critical problem solving skills.

Photo of Trish Kepler

Lauren Lamb


Lauren Lamb is a teacher at Saint Patrick’s Episcopal Day School in Washington, DC where she teaches grades 7 and 8 math. She is also a facilitator for Illustrative Mathematics.

Photo of Lauren Lamb

Bryan Meyer


Bryan has worked as a mathematics teacher, instructional coach, and mathematics specialist. His current interest and work center around (re-)designing systems in schools and districts to advance an equitable, joyful, and meaningful mathematics education.

Susan Jo Russell


Dr. Susan Jo Russell began her career in education as an elementary classroom teacher and math coach. She is a senior researcher at TERC where she co-directed the original development and second edition of Investigations in Number, Data and Space and the professional development series, Developing Mathematical Ideas. Her research has focused on children’s mathematical understanding and on how teachers can learn more about mathematics and about children's mathematical thinking. Current work centers on early algebra, number and operations, mathematical argument, and how teachers can support students to engage in mathematical practices.

Susan Jo Russell, Lecturer

Deborah Schifter


Deborah Schifter is a principal research scientist at the Education Development Center, Waltham, MA.  She has worked as an applied mathematician; has taught elementary, secondary, and college level mathematics; and, since 1985, has been a mathematics teacher educator and educational researcher.

Photo of Deborah Schifter

Karen Schweitzer


Karen Schweitzer, a teacher for 33 years, spent most of her career as a kindergarten, first and second grade classroom teacher. After a brief foray into sixth and fifth grade, she has now settled in as a third grade teacher at the Anne T. Dunphy School, where she has taught for the past 26 years.

Photo of Karen Schweitzer

Annie Sussman


Annie Sussman is a curriculum developer and education researcher at TERC in Cambridge, MA. She is passionate about the intersection of learning, design and technology and brings a strong background in teaching and learning to her work. Annie holds an M.A.T. from Smith College and has taught students in grades 1-6 in both public and independent school settings.

Annie Sussman, Lecturer

Jan Szymaszek


Jan Szymaszek is a third grade teacher at the Smith College Campus School in Northampton, Massachusetts, which is the laboratory school for the Smith College Department of Education and Child Study.

Photo of Jan Szymaszek

Kaneka Turner

Photo of Kaneka Turner giving a presentation

Liz van Cleef


Elizabeth (Liz) Van Cleef is a math coach in Arlington, Massachusetts. She received a Masters of Science in Teacher Education from the Bank Street College of Education, taught grades two through six in New York City, Denver, Colorado, and New London, Connecticut, and worked on the Investigations in Number, Data, and Space project at TERC in Cambridge, Massachusetts.

Polly Wagner


Polly Wagner has worked for Mount Holyoke College since 2006 facilitating Developing Mathematical Ideas and Professional Development for Coaching Mathematics courses – both online and hybrid – and most recently is launching a Professional Learning Community for math coaches. Wagner became a math coach and consultant after working on an NFS funded project called Teaching to the Big Ideas. She works in a wide range of schools across Massachusetts, private and public, urban and rural, small and large, specializing in K-8 mathematics.

Photo of Polly Wagner

Ann Zito


Ann Zito began her career in education as an elementary classroom teacher in Holyoke before transitioning to teaching math. Six years ago she began working with elementary teachers in the capacity of a Math Coach, spending the last four years in East Longmeadow Public Schools. She was selected to be a Math Ambassador by the Department of Elementary and Secondary Education, working on a long term project to create high quality tasks for teachers and to provide professional development inside and outside of her district.

Ann Zito, Lecturer