Our 2018 Leadership Team

Nils Ahbel

Deerfield Academy, Deerfield, MA

Nils is an author of 3 UCSMP textbooks and for the past 20 years has made his own Alternative to Precalculus (Precal & Stats) course available for free online at https://deerfield.instructure.com/courses/1232. He has done product development for TI and FluidMath and written curriculum for the US Dept of Ed. Nils regularly speaks at conferences including NCTM, NCSSM, UCSMP, 29 years at The ASG Exeter Conference (twice an evening speaker), TSM in England, and the TTL Institute in Australia. He also speaks at schools about relevant mathematics curriculum and innovative uses of technology.

David Bannard

Collegiate School, Richmond, VA

David has been teaching since 1969 including 17 years at the Groton School and the past 27 years at the Collegiate School in Richmond, Virginia. As one of the original beta testers for The Geometer's Sketchpad, he has been using technology in the classroom since the first conference in 1985. He now makes extensive use of Geogebra. He has participated in almost every Anja S. Greer Conference since 1985.

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.

Mary Bourassa

West Carleton Secondary School, Ottawa, Ontario, Canada

Mary currently teaches mathematics at West Carleton Secondary School in rural Ottawa, Canada. She is a strong advocate of the appropriate use of technology in the classroom. She connects with other educators via Twitter (@MaryBourassa) and learns everyday from others' blogs. She has presented workshops across Canada, the US and Australia. She is a past director and Vice-President of the Ontario Association for Mathematics Education. Winner of several awards from NCTM and OAME, Mary continually strives to learn new and better ways of helping students learn and love mathematics.

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 32 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 28 years, including ten years as a teacher leader in the Woodrow Wilson Fellowship Foundation and 26 years as an instructor in the Anja S. Greer Conference. Dan likes to live by the motto, "See the World, Do Math."

Jonathan Choate

Groton School, Groton, MA

Jonathan has taught mathematics at Groton School since 1966. He is the co-author of The Dynamics Toolkit, four books covering topics in fractal geometry and chaos theory. He has served on both NCTM's Algebra and Discrete Mathematics Task Forces. His column, Geometer's Corner, is a regular feature in COMAP's Consortium newsletter, and he has created a web site dedicated to the teaching of three-dimensional geometry which can be found at www.zebragraph.com. The website includes information about how Google SketchUp can be used in the teaching of geometry.

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 one 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.

Anthony DiLaura

Zeeland Public Schools, Zeeland, MI

Anthony is a high school math teacher, STEM educator, and instructional technology specialist. In 2013 he was awarded the “Apple Distinguished Educator” title and in 2015 he was nationally recognized as the “iBooks Author Trainer of the Year” for his innovative workshops that help educators author multi-touch textbooks for the iPad. Anthony teaches in a 1:1 iPad environment and testifies to the profound impact iPads and iBooks have on student learning. Anthony enjoys sharing his knowledge and enthusiasm while helping teachers redesign their instruction by adding iPads to the math equation!

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 high school teachers and students in precalculus and calculus courses and was involved with distance learning broadcasts for many years. She has been an instructor in numerous workshops for teachers focusing on Precalculus, Calculus and Statistics. Most Saturday mornings you can find her exploring math with middle school students in the Chapel Hill Math Circle. When school is not in session she is knitting or quilting or in her garden.

Aviva Halani

Phillips Exeter Academy, Exeter, NH

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.

Maria Hernandez

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

With over 25 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 secondary schools since 1995 after teaching at Merrimack College  and the State University of Buffalo for 8 years. He is a student of Zbigniew Zielezny and earned his Ph.D. in Distribution Theory in 1989. He created a "math for teachers" seminar course while at Merrimack that was based on the use of historical materials and is a vigorous proponent of teaching the history of mathematics. He has been teaching a course in history of math at the secondary level at Exeter since 2002. He holds the Smith Teaching Chair in Mathematics.

Doug Kuhlmann

Phillips Academy, Andover, MA

Doug recently retired after 40 years in secondary boarding schools, the last 31 at Philips Academy. He received his B.S. in math from St. Louis U. in 1968, and his Ph.D. from Northwestern in 1978. He enjoys learning and teaching mathematics and is particularly interested in using GeoGebra in precalculus and calculus courses in high school. An active participant on the AP Calculus EDG, he has studied at Cambridge University during his first sabbatical and at Boston University during his second. He enjoys walking with his wife along Plum Island beach and also enjoys singing in the choir.

Ron Lancaster

University of Toronto, Toronto, Ontario, Canada

Ron is an Associate Professor at the University of Toronto where he teaches mathematics methods courses for future middle and high school teachers.  He has over 20 years of experience teaching grades 7-12 mathematics.  Ron's professional activities include consultations and conference presentations in North America, Asia, England, Abu Dhabi, Dubai, Qatar, Africa and India.  Ron is an author for the NCTM (The Mathematical Lens) and member of the Advisory Board for the Museum of Mathematics in New York City.  He is the recipient of the 2015 Fields Institute Margaret Sinclair Memorial Award.

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. 

Mike May

Saint Louis University, St. Louis, MO

Mike earned his Ph.D. in mathematics from U.C. Berkeley. He has worked on appropriate ways to incorporate technology into teaching for more than 20 years. He has made presentations and published on a variety of technologies including: designing computer classrooms, appropriately using graphing calculators, Maple, Excel, applets, GeoGebra, and automated homework systems. Mike is an AP reader, a PREP workshop leader (https://prep11geogebra.pbworks.com), a Fullbright specialist in math ed, an MAA trainer for WeBWorK, and has designed material used in MyMathLab.

Greta Mills

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

Greta's fascination with mathematics has evolved over her 20-year teaching career from a love of pure math to embracing applied mathematics, and she strives to teach all classes from a modeling perspective. As the recipient of New Hampshire's 2010 Christa McAuliffe Sabbatical Award, Greta shared her modeling experience with other NH schools. Since 2012, Greta has served as a judge for the Moody's Mega Math Challenge, and she regularly presents at NCTM conferences focusing on modeling applications, from Geometry to Calculus and beyond.

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 23 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.

Ira Nirenberg

Benjamin Franklin High School, New Orleans, LA (retired)

Ira worked as a geophysicist for six years prior to entering the teaching field. His teaching career spans 30 years having taught at Benjamin Franklin High School and Lusher High School in New Orleans, LA, the University of Chicago Laboratory Schools, several universities, and schools abroad. He has taught AP Physics C & B, Astronomy and much of secondary mathematics. He has written four books: Intermediate Physics (Free eBook), Living With Math (Free pdf version--www.ontele.com), The Fraction ThinkBook (eBook) and, Alabama Whistle (fiction-eBook). This will be his 18th year at the Conference.

Philip Rash

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

Philip is in his thirteenth 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 36 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 (T3 national instructor), SMART Boards, iPads, problem solving strategies, questioning techniques, and computer algebra systems. Tom is a frequent speaker at NCTM and T3 national, state, and regional conferences. He is a Presidential Awardee and has earned National Board Certification.

Annalee Salcedo

Cate School, Carpinteria, CA

Annalee has taught in independent and public high schools since 1996.  She joined the Cate faculty in 2009 as a member of the math department, where she teaches Algebra 2, Pre-Calculus, and Calculus.  In 2015, she was appointed Head of the Math Department and was also awarded the Paul M. Denison '52 Teaching Chair for excellence in teaching. In 2011, she was the first recipient of Cate’s Centennial Award, recognizing innovation in classroom instruction. Annalee works in Cate's Outdoors Program, and chairs the Design Team, working with faculty to improve instructional and assessment practices. 

Johnothon Sauer

William Mason High School, Mason, Ohio

Johnothon Sauer is the math department chair at William Mason High School in Mason, Ohio. 2016-2017 marks his 16th year at Mason and his 27th 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.

Lauren Shareshian

Oregon Episcopal School

Lauren's foray into teaching began as a graduate instructor for the Duke laboratory calculus program, where real world, hands-on activities were emphasized. Since then, Lauren has continued to incorporate modeling and technology into courses at the Oregon Episcopal School in Portland, OR. She has coached winning teams in the HiMCM modeling competition and in her quest to combine math, statistics, and computer science topics, she recently completed a Seattle data science intensive. Currently, she is incorporating Python and data science into her school's math and computer science curriculum.