It was Escondido Tutorial Service (or ETS, for short), which has its home in Escondido, CA. He also did a year of Latin with Oxford Tutorials , which is based in Seattle, WA. Both excellent services run by professors who clearly love what they're doing and who certainly challenge their students.
I've heard of them both. That's great. Wouldn't it be great if public schools could offer something like that.
Actually, in the next county over from me, there is a classical charter school for middle school kids which offers a kids' Great Books curriculum. The education they offer is considered too "elitist" around here.