Ah, just looked up his information.
Assistant Professor of Mathematics and Computer Science, Drury University, 1996–2001
Faculty Center for Teaching and Learning, North Carolina State University, 2001–02
Mathematics teacher, Enloe High School, Raleigh, N.C., 2002–12
Rater, reader, scorer, and test-preparation instructor for a number of ETS programs, 2005-present
Program rater, National Center for Teacher Effectiveness, Harvard University, 2011-present
He has a BA, MA, and a fucking PhD and currently a math teacher at some boujee "co ed independent day" school (whatever that is)