I've been a full-time classroom teacher since 2007. I currently teach Math and Mathematical Art at John Burroughs School. I also run the JBS Math Circle, which meets irregularly to explore all aspects of the mathematical world from puzzles and riddles to art and mathematical games.
Previously I worked at Saint Ann's School in Brooklyn, where I was lucky enough to offer a number of original math courses like "Algebra 2: Functions and Abstract Algebra" and electives such as "The Complex Plane."
Also while at Saint Ann's, I cofounded a mathematical art program for grades 3-12 which included a high school seminar, a middle school elective, and an all-school mathematical art festival called MArTH Madness.
I was very fortunate to work in a wonderful department full of brilliant mathematicians, teachers, and artists, including Paul Lockhart, and my Math Munch coauthors, Justin Lanier and Anna Weltman.
For many years, I've coauthored Math Munch, a site where anyone can find a curious and enticing thread to follow out into the mathematical internet.
Math Munch at TEDxNYED 2013
For a couple of years I wrote a blog about math and school, called Lost in Recursion. For the time being it can still be seen.
In 2014, I founded Art of Math STL, so that I could share mathematics with kids outside of the math classroom. In addition to private sessions, I run a math circle for 3rd and 4th graders at Reed Elementary.
For a while I taught classes at the very cool Brooklyn Brainery, and I sometimes dream of starting something like that in St. Louis.