Our 2022 Leadership Team

Kevin Bartkovich, Conference Director

Phillips Exeter Academy

Kevin moved to Exeter in the fall of 2009, where he began teaching in the math department and was named Director of the Conference in 2018. Prior to life at PEA, Kevin was a founding faculty member at NCSSM, where for 17 years he taught and worked with colleagues to write precalculus and calculus textbooks. In between, Kevin and his wife JD went on a 10-year adventure in Uganda where they established Christ School - Bundibugyo, a boarding secondary school located in a remote village near the border with Congo. Kevin and JD are licensed foster parents in NH, and they currently have 9 children.

Christine Belledin

North Carolina School of Science and Mathematics, Durham, NC

Christine joined the NCSSM mathematics department in 2006.  She teaches a wide range of courses, including Precalculus, Calculus, and Mathematical Modeling.  She has developed online courses in Multivariable Calculus and Complex Systems, and for several years has explored ways to use technology as powerful teaching tools in both traditional and online courses settings.  She strives to bring interesting and relevant problems into every course and is an advocate for educational equity and access.  She loves music and crafts and enjoys exploring ways to merge her interests in mathematics and art.   

Eric Bergofsky

Phillips Exeter Academy

Eric has taught high school mathematics since 1973 and has been an instructor at Phillips Exeter Academy since 1977. He is a former leader and director of the Exeter Math, Science, and Technology Conference, a former department chair, and was also the director of the Exeter Mathematics Institute from 1992-2013. Eric has had a long time interest in the use of technology activities as well as hands-on activities in the classroom. Eric co-authored the book "Exploring Algebra with The Geometer's Sketchpad", published by Key Curriculum Press.    

Curtis Brown

Texas Instruments Inc.

Curtis taught mathematics and AP® Statistics for several years in Pasadena, TX and spent 5 years working for the National Math and Science Initiative as the Statistics Curriculum Coordinator. He currently works as the Math Segment manager at Texas Instruments Inc. Since starting at TI in 2015 he has led many content development projects including the Modeling with Mathematics series. He has always found joy in exploring the patterns and logic of mathematics. In his spare time he enjoys kayak fishing, and mountaineering with his sons and spending time with his family.    

Dan Butler

The Lovett School

Dan has been teaching math at the middle school and high school level for the past 38 years in the public  and private school systems. He has taught all mathematics courses from pre-algebra to multivariable calculus and linear algebra. Dan gives numerous workshops in mathematics both in the United States and abroad. He has been involved in professional development workshops for the past 32 years, including ten years as a teacher leader in the Woodrow Wilson Fellowship Foundation and 30 years as an instructor in the Anja S. Greer Conference. Dan is passionate about math and math education

Laurie Cavey

Boise State University, Boise Idaho

Laurie has been teaching mathematics courses for teachers for over 20 years. She specializes in mathematical knowledge for teaching concepts related to algebra, functions, and mathematical modeling at the secondary levels. She enjoys using investigations of students' mathematical ideas to support teachers in their efforts to recognize productive mathematical reasoning and to inform their responses to students' ideas. Prior to her teacher education career, she taught mathematics at the North Carolina School of Science and Mathematics.

Rachel Chou

Menlo School

Rachel has been teaching math to students in grades 6-12 since 1998. She has been the chair of the Math Department at Menlo School in Atherton, CA for 13 years. Under her leadership, the Menlo math department went textbook-free, favoring teacher-authored curricular materials. Rachel has co-led professional development courses with Henri Picciotto. In the summer of 2019, she offered 3 different workshops at the Mathematics Educators Convergence in Columbus, Ohio. She has dedicated her career to constructing tasks that help students build meaningful intuitions for varied mathematical topics.     

Ken Collins

Charlotte Latin School, Charlotte, NC

 Ken has a B.S. in physics and M.S. in math from BPI/NYU and a Ph.D. from Purdue University. He has taught for fifty five years in middle school through graduate school. His focus is on effective use of technology and applying mathematics to analyze current issues. He teaches calculus and algebra II with extensive use of calculator technology. Ken gives five to ten workshops each year at regional and national conferences of NCTM, ACA, and T^3. He is currently writing curriculum material for classroom explorations in mathematics and using mathematics to analyze critical problems in our society.   

Diana Davis

Phillips Exeter Academy

Diana teaches math, coaches girls’ cross country and is a dorm head at PEA. She previously created and taught problem-centered, discussion-based math classes at Northwestern University, Williams College and Swarthmore College. Outside of teaching and pedagogy, she does research in geometry, dynamical systems, and gerrymandering. She also attended PEA as a highly engaged high school student. Diana has worked at the conference since 2004 and as a leader since 2012. She loves to create opportunities for people to think deeply about math and discuss it with each other.   

Aviva Halani

Phillips Exeter Academy

Aviva has B.A. from Wellesley, and an M.A. and a Ph.D. from Arizona State. Though her degrees are in mathematics, her research has focused on students' problem solving approaches to counting problems, instructional interventions, and student understanding of calculus concepts. She has presented her results at numerous conferences. In Arizona, she was a Math Content Expert for Adaptive Curriculum, an ed tech company which develops highly interactive digital math and science lessons, and taught at ASU. She has been teaching various courses from algebra to calculus to proof at Exeter since 2013.   

Mahmoud Harding

North Carolina School of Science and Mathematics

 Mahmoud is a NC native who has taught math and data science at NCSSM for 5 years. He enjoys developing course material and collaborating with colleagues on projects. He taught both university and secondary school in the Middle East from 2002 to 2017. Previously, he worked as a programmer at Vf Corporation and as a systems analyst at IBM and Revlon. He holds a B.S. in Mathematics Education with a minor in Computer Science, an M.S. in Applied Mathematics and most recently completed a Graduate Certificate in Applied Statistics and Data Management.   

Jeff Ibbotson

Phillips Exeter Academy

 Jeff has been teaching in private schools since 1995. Prior to that he taught mathematics at Merrimack College. While there he designed a course in history of mathematics for secondary level teachers. He has also been involved in teaching advanced math at high schools (Group Theory, Real and Complex Analysis and Game Theory) and currently serves on the MAA's Board of Governors.    

Ron Lancaster

University of Toronto, Toronto, Ontario, Canada

 Ron is an Associate Professor Emeritus at the University of Toronto where he taught mathematics courses for pre-service teachers for 17 years. Ron taught grades 7-12 math for 23 years in coed public schools and a K-12 all-girls school. Ron's professional activities include consultations and conference presentations in North America, Asia, England, the Middle East, Africa and India.    Ron has authored/edited over 150 articles for the NCTM (Mathematical Lens, Media Clips) and is the recipient of the 2015 Margaret Sinclair Memorial Award in Mathematics Education awarded by the Fields Institute.   

Philip Mallinson

Phillips Exeter Academy, Emeritus

Phillip MallinsonPhilip started his math teaching career in 1970 at a tiny private school, now defunct, in Vermont. From there he went to the University of Washington in Seattle to earn a license to teach mathematics. He was an instructor briefly at the University of Washington and then taught at a private school in Seattle until 1994. At this point Tom Seidenberg lured him to Exeter where he has been until he retired in 2015. He has been active with the geometry team of the Woodrow Wilson workshops in the 80's and 90's and also with the Park City Math Institute since its inception. 

Greta Mills

Oxbridge Academy of the Palm Beaches, West Palm Beach, FL

Greta's fascination with math has evolved over her career from a love of pure math to embracing its applications. As the recipient of New Hampshire's 2010 Christa McAuliffe Sabbatical Award, Greta worked with NH teachers to design and pilot modeling projects. Her math modeling class has produced winning teams in the HiMCM Modeling Contest, and Greta has served as a judge for the Moody's Mega Math Challenge since 2012. She is also a member of the Math Modeling Faculty Mentoring Network. In 2017, Greta's Digital Logic class built and wrote code for a drone that *almost* flew!

Tom Reardon

Austintown Fitch High School and Youngstown State University, Youngstown, OH

Tom taught for 35 years at Fitch High School, 39 years at Youngstown State University. Since 1995, he has been providing Professional Development about creatively integrating pedagogy and technologies appropriately in 7-12 math classrooms nationally (49 states) and internationally (8 countries). His specialties are math modeling for social awareness, transformation graphing and geometry, problem solving strategies, ACT/SAT math prep. Tom is a frequent speaker at NCTM and other national, state, and regional conferences. He is a Presidential Awardee and has earned National Board Certification.   

Jessica Schenkel

Porter-Gaud School

Jessica has been an instructor of mathematics for the past fourteen years in public, independent, and boarding schools. She is an advocate for offering a rigorous, relevant mathematics curriculum that meets every learner where they are. She currently serves as the Mathematics Department Chair at Porter-Gaud School in Charleston, SC and has taught a variety of courses from Algebra I to AP Calculus BC. Jessica believes in designing class activities that are discovery based and engaging, giving students multiple opportunities to become flexible, discerning problem solvers and thinkers.    

Drorit Weiss

Anne & Max Tanenbaum Community Hebrew Academy of Toronto (TanenbaumCHAT)

Drorit Weiss is a mathematics, physics and computer science teacher. As a former software engineer, she is a strong leader in online learning and an advocate of innovative technology use in the classroom. Drorit received much media attention for her creative Math/Science raps that can be seen on her YouTube channel, Slice of Weiss. Since the release of her videos, Drorit has been invited to speak at conferences, panels, and has been serving the community as an educational role model for women in STEM. She is currently the Ontario coordinator for the NCWIT Aspirations in Computing award.

Julie Van Wright

Phillips Exeter Academy

Julie has taught a wide range of middle and high school math classes over the last 10 years. Before joining the math faculty at Phillips Exeter Academy in 2019, Julie developed and taught student-centered and Harkness-based math classes at independent schools in Rhode Island and Colorado. While she enjoys teaching at all levels, Julie especially appreciates teaching Algebra 1 where so many underlying concepts come together to help students build their future foundational understanding of math.   

Dashiell Young-Saver

KIPP Texas Public Schools

In 2019, Dash decided to make his AP Stats class relevant. Working at a Title 1 school in San Antonio, he created lessons on topics his students cared about: policing and race, food deserts, sports, online dating, and much more. That year, more students at the school took and passed the AP exam than in the prior 16 years combined. Dash subsequently founded Skew The Script - a nonprofit that provides free & relevant math lessons to teachers. He currently teaches at KIPP Texas public schools, writes math lessons for the NY Times, and is an AP Daily instructor & exam reader for AP Stats.