Devin
GMAT, LSAT, and GRE tutor who literally wrote the books
I spent over a decade working for that big test prep company you're thinking of, the one with the purple books. While I was there, I was named one of their first ever "Elite" teachers, was chosen as one of the first three teachers to teach their online classes, rewrote many of their course books and developed other study aids, and, when I left to go to grad school, was rated by students as their top GMAT teacher in New York and top-five nationally (I was up there in LSAT and GRE too, but at t...