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Meet our Content Specialists.

We're working hard to ensure our math content rigorously and comprehensively covers the Common Core Standards, a set of math standards that most of the states in the U.S. have adopted. Like the authors of the Standards, we believe that conceptual understanding, procedural fluency, and application are all critical and complementary features of an excellent math education. By covering the Standards, we hope to provide rich and engaging math content that can help students of all ages learn math thoroughly and joyfully.
To cover the Standards, we've brought on a team of fantastic math teachers, tutors, and professors, who write math questions and peer review one another's content. We regularly deploy new Common Core-aligned content on our site and refine it based on user feedback. We're also fortunate to partner with organizations and advisors whose insightful input helps us continuously improve our content. Check out our Common Core resources, including a complete mapping of our content to Common Core Standards.


Mike earned a M.Ed. in Secondary Education and spent 11 years teaching theatre and communication classes in Arkansas and Massachusetts before turning his attention to the Internet . He has experience in entrepreneurship, e-commerce, and search engine optimization (SEO). He co-founded a search engine marketing firm and an e-commerce website focused on Southern style called Bourbon & Boots.

In his spare time he likes to run, swim, read, and tend to his 3 children, 3 dogs, and 7 chickens. All with the help of his beautiful partner and fellow suburban farmer, Susan.


Lisa is a K-8 Math Specialist in Aventura, Florida who is passionately devoted to helping children and adults make sense of math. She serves on the editorial panel for the National Council of Teachers of Mathematics journal Teaching Children Mathematics and has published problem sets and a research study on visual models in problem solving.

Lisa also presents nationally on Common Core Math and Singapore Math, blogs at mathspot.net, and designs mobile apps for Common Core Math.


Per used to teach math to high-school students in Chicago Public Schools.

Now, in addition to writing math problems, he teaches math to college students and studies set theory in Berkeley.


Rhonda is Professor Emeritus at Bryn Mawr College, where she taught and did research in mathematics for thirty-one years.

She also co-founded The EDGE Program (Enhancing Diversity in Graduate Education), which supports women pursuing PhDs in the mathematical sciences. She served as its Co-Director from 1998-2011.


Sandy has a deep love of teaching math at any level to students, parents, and random people on the street.

Her favorite Einstein quote is, "If you can't explain it simply, you don't understand it well enough." Before working at KA, she was an electrical engineer, a high school math teacher, and a tutor for students aged 7 to 70.


Sharon is a teacher to the very core, having taught kids, adults, and adults who teach kids in Bay Area schools. She relishes doing whatever it takes to help others see the beauty and elegance in math.

Sharon was drawn to Khan Academy when she started messing with it herself and saw its potential for changing how education happens.


In life, as in mathematics, Tomer is always looking for new adventures and uncharted territories to explore. In between traveling around the world, he earned a bachelor's degree in Mathematics and a master's degree in the History and Philosophy of Science in Tel Aviv University.

He is hoping to combine his experience as a tutor with his theoretical knowledge to bring fresh and surprising approaches to familiar mathematical subjects.


Brad is a teacher and the math department head of Hillside Student Community. Brad majored in physics at the College of Wooster, but his true passions are teaching math and computer science electives. Inspired by Sal and the opencourseware movement, Brad has experimented with flipping his intro programming elective and is currently recording all of his Precalculus lectures for his flipped Precalculus class. He is also pretty fond of rock climbing and geeking-out on Coursera.


Gail began her career as a 3rd grade teacher in Massachusetts, and since then has taught Kindergarten and first grade. She has also worked as an ESL teacher for Grades K-4, teaching mostly Kindergarten students.

Gail has a degree in English and Early Childhood, with a Master's degree in Education. She finds making math exercises exciting and is happy to be engaging young children in the world of math, especially her two daughters.


Cloud grew up in Los Angeles, California. After a stint in Minneapolis, Minnesota researching solar cells, he realized that it gets cold there and moved back to the warmth! Having used Khan Academy in his studies, he feels that everyone should have the opportunity to access quality education.

Cloud loves the outdoors and tries to climb whenever possible. He also likes tinkering and making things from scratch.


Lindsay is excited about math education. She taught secondary math for eight years and currently works as a content and curriculum writer. She also serves in the university setting creating graduate level coursework for math educators.

In addition to being an educator, Lindsay enjoys watching college football and basketball, running, and coaching four-year-old soccer.


Casey is the founder of Atlanta's Eclectic Music, where hundreds of kids take music lessons. Casey grew interested in math education after she began the Little Middle School, a homeschool academic program. While myths about talent confront music and math students alike, Casey believes that anyone can succeed with great materials and coaching. She is thrilled to be part of Khan Academy's effort to provide a quality education to millions.

Ben S.

Ben grew up in Minnesota before moving to Wisconsin to switch from Gopher to Badger and study quantitative things.

He is now a high school math teacher with Teach for America in Warren County, North Carolina.

Ben C.

A Virginia boy, Ben graduated from UVA in 2010. After graduation, he rode his bicycle across the country, volunteered as an English teacher in Honduras, and worked at a rock climbing gym. He then worked as a high school math tutor and became a middle school math teacher for one year. Ben has been a camp counselor for six summers and loves outdoor and athletic activities. One day he hopes to start his own summer camp.


Sarah’s passion for teaching includes helping students understand math, while developing a love of learning. Sarah has taught elementary school in both Reno and Las Vegas, Nevada for many years. Sarah has undergraduate degrees in Elementary and Special Education from the University of Nevada, Reno. She also has a M.Ed. in Curriculum and Instruction from the University of Nevada, Las Vegas.


Liat is a certified teacher in Aventura, FL. Through her passion for the arts, she enjoys engaging children in mathematical thinking and helping them develop a love of learning at an early age. Liat has published several problem sets in Teaching Children Mathematics and is also a licensed Zumba instructor.


Teri loves developing math activities that engage students and help them make sense of math. Along with teaching high school and middle school math, she has helped develop print and digital products for high school and college math courses. Prior to her work with math education, she developed radar and satellite data display programs for a group researching the ionosphere.

Ben L.

After graduating from Columbia University with a Film Studies degree, Ben remembered that his true passion was for mathematics. He joined the New York City Teaching Fellows and took a post at Brooklyn’s High School of Telecommunication Arts and Technology, where he taught the gamut of high school math courses over eight wonderful years.

When not writing questions for Khan Academy, Ben enjoys traveling, reading, and playing soccer.


Lori is a university instructor in Louisiana. For the past 5 years, she's taught and coordinated freshman-level college algebra and precalculus courses.

She received her B.S. in Mathematics from the University of Illinois at Urbana-Champaign and her M.S. in Mathematics from Southern Illinois University at Carbondale.


Chris is a test prep tutor living in Oakland, California. He earned a degree in cognitive science from UC Berkeley in 2010. He also spends his time writing for an education blog and singing in a cappella groups.

As a tutor, Chris is able to help only those students whose families can afford expensive tutoring, so he is excited to be part of a project that will help bring education to students of all backgrounds.


A lifelong Southern Illinoisan, Brenda has teaching experience in the Illinois public schools and community college system. She currently enjoys working with Khan Academy and teaches community college courses.

She received both her bachelor's and master's degrees from Southern Illinois University at Carbondale.


After growing up on an Iowa farm, Duane received a PhD in mathematics from Colorado State University. Duane has been on the mathematics faculty at Loras College and Loyola Marymount University and is currently entering his 28th year as a Lecturer in the Department of Mathematics at the University of California, Davis.

Duane is an avid bicyclist, international traveler, and goodwill basketball ambassador, and he's been a member of the UC Davis men's basketball coaching staff for 18 years.


Ivan completed his undergraduate studies in Electrical Engineering, then did a M.Sc. in Physics, and a Ph.D. in Computer Science, all at McGill University.

His research interests include information theory (quantum stuff) and machine learning (data stuff). Ivan has been teaching math and physics for more than 12 years as a private tutor. He recently wrote a math textbook and founded a textbook publishing company.


Ryan hails from North Carolina. He earned his undergraduate degree in Mathematics from Reed College.

In his free time, he enjoys frustrating video games and playing tennis poorly.


Tara is a math teacher at Ben Franklin High School in New Orleans.

Prior to that, she was living, learning, and teaching in Philadelphia. She earned her M.S. in math education from Drexel.