He went on to get his PhD, with his dissertation focusing on a site in Michoacán, Mexico. While doing a survey in the area, he came across what looked like the remains of a small pre-Columbian village scattered about an ancient lava bed, called Angamuco, once a settlement of the fierce Purépecha (Tarascan) people, who rivaled the Aztecs in central Mexico from around AD 1000 until the arrival of the Spanish in the early 1500s.
