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Our 2020 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 8 children.

Javier Alvarez

Phillips Exeter Academy

Javier has been a mathematics educator for 22 year, including 14 years at Pomfret School in Connecticut, 3 years at St. Paul's School in New Hampshire and now starting his first year at Phillips Exeter Academy.  At Pomfret School, he helped develop and promote the Statistics curriculum increasing the student participation from 12 per year to more than 60 per year.  Javier has been an AP Statistics Reader since 2011 and has worked for ETS reviewing and developing math items for the Winsight Program.   

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, Exeter, NH

Eric has taught high school mathematics since 1973 and is currently the Department Chair and in his 39th year as an instructor at Phillips Exeter Academy. He is a former leader and director of the Exeter Math, Science, and Technology Conference, 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.

Floyd Bullard

North Carolina School of Science and Mathematics, Durham, NC

Floyd has taught high-school mathematics for twenty years, including two as a Peace Corps Volunteer in Benin, West Africa, and is currently at the North Carolina School of Science and Mathematics.  In May 2009 he received a PhD in statistics from Duke University; his dissertation about exoplanet detection is summarized on dissertationhaiku.com.  Floyd has served on the AP Statistics test development committee and he is a coauthor of "Stats Modeling the World," fifth edition.  Floyd lives in North Carolina with his partner of 17 years and husband of one year (they're the same person), Rick.   

Dan Butler

Mounds View High School, Arden Hills, MN

Dan has been teaching mathematics at the middle school and high school level for the past 35 years in the public school system. He has taught all mathematics courses from prealgebra 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 30 years, including ten years as a teacher leader in the Woodrow Wilson Fellowship Foundation and 28 years as an instructor in the Anja S. Greer Conference. Dan likes to live by the motto, "See the World, Do Math."

Rachel Chou

Menlo School, Atherton, CA

Rachel has been teaching math to students in grades 6 thru 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 school’s math department went textbook-free, favoring teacher-authored curricular materials. Rachel has co-led professional development courses with Henri Picciotto. Last summer, 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 two 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

Swarthmore College, Swarthmore, PA

Diana works at Swarthmore College, teaching college students in problem-centered, discussion-based math classes, and doing research in geometry and dynamics. She attended Phillips Exeter Academy as a highly engaged high school student, and has also taught in the PEA math department. This will be Diana's fifth year as a leader at the conference. She loves to create opportunities for people to think deeply about math and discuss it with each other. In the wider world, Diana is best known for making a video that explains her math research through dance. Check it out.

Taylor Donovan Wyatt

Cate School, Carpinteria, CA

Taylor joined the Cate math department in 2011 where she teaches Problem Based Learning (PBL) courses using Exeter’s materials. She has a passion for considering the PBL classroom as a foundation for inclusive and intellectually rigorous education. She’s also had the opportunity to pilot the department’s iPad program in a Harkness discussion setting. She’s been the recipient of Cate’s Centennial Fellowship for innovative teaching and Circumspice Fellowship for excellence in broad-based engagements with the community. Taylor also coaches soccer and leads Cate's Servons Speaker Series.    

Stephanie Girard

Phillips Exeter Academy, Exeter, NH

Stephanie began teaching in 1983 at Charlottesville High School in Charlottesville, Virginia after completing her Master's degree at the University of Virginia.  She joined the faculty of Phillips Exeter Academy in 1986. She has been active in the mathematics departments' editorial work for several summers,has been a MST Conference participant several times,was a leader in the Exeter Math Institute for two years,is a faculty member of Exeter Summer and is the co-coordinator of the Summer Math Acceleration Program. Stephanie is the current John E. and Mary E. Smith Professor of Mathematics.


Julie Graves

North Carolina School of Science and Mathematics, Durham, NC

Julie has taught mathematics at the North Carolina School of Science and Mathematics since 1985. She has developed curriculum for precalculus and calculus courses and was a contributing author of two textbooks written by the NCSSM Math Department. She has led many workshops for teachers focusing on Precalculus, Calculus and Statistics. Her interests include helping students and teachers become more confident mathematical modelers. She taught at Deerfield Academy for the 2017-18 school year. She moved back to North Carolina in June of 2018. Since then, she has been making her garden grow again.

Maria Hernandez

The North Carolina School of Science and Mathematics, Durham, NC

With over 30 year of teaching experience, Maria has developed curricula for high school students in various mathematics courses. She has lead teacher collaborations via distance learning and has taught workshops for courses from Algebra I to AP Calculus. Her focus is using mathematical modeling, discovery-based activities, technology and real-world problems to engage students as active learners in the mathematics classroom. Maria received The 2009 Presidential Award for Excellence in Mathematics Teaching and The UNC Board of Governors Award for Excellence in Teaching in 2013. 

Jeff Ibbotson

Phillips Exeter Academy, Exeter, NH

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 at the University of Toronto where he teaches mathematics courses for pre-service middle and high school teachers. He has 23 years of experience teaching grades 7-12 mathematics. Ron's professional activities include consultations and conference presentations in North America, Asia, England, the Middle East, Africa and India. Ron is an author for the NCTM (The Mathematical Lens) and member of the Advisory Board for the Museum of Mathematics. He is the recipient of the 2015 Margaret Sinclair Memorial Award in Mathematics Education awarded by the Fields Institute.

Stanley Lo

University of California San Diego

Stanley is a faculty member in Mathematics and Science Education and in Biological Sciences at University of California San Diego. He received his B.S./M.S. in Molecular Biophysics and Biochemistry from Yale and Ph.D. in Biochemistry from Harvard. He was a research associate in Learning Sciences at the Searle Center for Advancing Learning and Teaching at Northwestern. Before graduate school, Stanley taught at Phillips Exeter Academy, where he first developed his interests in education. Since 2011, Stanley has been a National Academies Education Fellow and Mentor in the Life Sciences.   

Philip Mallinson

Phillips Exeter Academy, Exeter, NH

Philip 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!

José Molina

Phillips Exeter Academy

José has been teaching high school mathematics for the last 25 years. Twenty two of those years, José taught all levels of high school mathematics, including AP Calculus AB, BC at Bellarmine College Preparatory in San Jose, Ca.  For the last three years, José has taught at Phillips Exeter Academy where José has taught from the Math 2, 3, 4, and 5 books. In addition José has taught the Lab Calculus courses. José is also a reader of the College Board's Calculus AP exam, since 2003.   

Stuart Moksowitz

Humboldt State University, Arcata, CA

Stuart plays with puzzles when not teaching math. Inspired by Martin Gardner and Lewis Carroll, he uses puzzles to teach math.  Besides puzzles, Stuart has a passion for using history, technology, and multiculturalism as a means for making math more meaningful, useful, and alive. Besides 24 years of teaching math and math education classes at Humboldt State U on the north coast of California, besides collecting and studying puzzles for almost 60 years, Stuart leads workshops for teachers around the world, has been a math coach, a conference chair, and an author of teacher resource materials.

Matt Pigg

Oregon Episcopal School

Matthew started teaching during the second year of the Teach for America program.  After teaching in Houston, Los Angeles and Davis, he began working in Teacher Professional development for the University of California.  Combining his work as a teacher and experience as a programmer, Matthew developed web-based applications for teacher training and professional development programs for veteran teachers.  Matthew has a BA from UC Berkeley and an MA in Education from Cal State.  In addition to teaching at OES, Matthew enjoys riding his bike(s), cooking, hiking, traveling and writing code that solves real and not-so-real problems.

Philip Rash

North Carolina School of Science and Mathematics, Durham, NC

Philip is in his fifteenth year as a member of the NCSSM Mathematics faculty. A NC native, he earned Bachelor and Masters degrees in western NC, and has high school and university teaching experience prior to NCSSM. At NCSSM Philip teaches Calculus, Statistics, and several post-calculus elective courses. He's also very involved with math contests, including co-chairing the NC State Math Contest committee of the NC Council of Teachers of Mathematics. Some of Philip's awards include the 2016 UNC Board of Governors teaching award and a 2008 MAA Edyth May Sliffe Award.

Tom Reardon

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

Tom taught for 35 years at Fitch High School and 38 years at Youngstown State University. Since 1995, he has been doing Professional Development about creatively integrating pedagogy and appropriate technologies in 7 - 12 math classrooms nationally and internationally. His specialties are graphing technologies, SMART Boards, problem solving strategies, questioning techniques, ACT and SAT prep, and math modeling for social awareness. 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.

Johnothon Sauer

William Mason High School, Mason, Ohio

Johnothon is the math department chair at William Mason High School in Mason, Ohio. 2018-2019 marks his 18th year at Mason and his 29th year of teaching. Raised in Columbus, Ohio, Johnothon earned his B.S.Ed. from The Ohio State University, taking courses that led to his certification to teach mathematics and music in grades 7-12. He subsequently earned his M.A.T. and Ph.D. in Mathematics from The University of Cincinnati. Johnothon is a strong advocate of student-centered, discussion-based learning, and in particular of the Harkness Method of instruction and Evidence-Based Assessment.

Jessica Schenkel

Porter-Gaud School

Jessica is a teacher at the Porter-Gaud School in Charleston, SC. She is the chair of the math department and oversees the development and implementation of the curriculum for grades 1 – 12. Jessica has been teaching upper school mathematics for eleven years. She serves as the co-sponsor to the student council at her school and loves working with students in a variety of capacities. She is a strong advocate for offering relevant mathematics curriculum and the development of the whole student. 

Nat White

Groton School

Nat has loved mathematics for as long as he can remember, and he wants others to share that same love. A teacher and coach at Groton School, Nat's first deep dive into the fun and memorable aspects of high school math came as a participant in this conference. Since then, he worked in an early iteration of the Undergrad Biology and Mathematics program at UW-Milwaukee and has worked with colleagues and students at Hotchkiss (where he was a department chair) and Groton to make high school math memorable, meaningful, and fun for students and teachers alike.