Since 1992, he has been an active member of the excavation team at the ancient site of Gordion (central Turkey), where he has been studying the economic and social history of the small Roman-period town that flourished there between the 1st and 5th centuries AD. He has recently published several Latin inscriptions and the funerary finds from the Roman cemeteries at Gordion. During the summer of 2004 and 2005, with the aid of a Loeb Foundation Grant from Harvard University, he directed a team of archaeologists and assistants in what was the first systematic excavations of the Roman town on the site. In the course of this fieldwork, Roman weapons and armor were unearthed, providing the first concrete evidence for the hypothesis that the town was a minor Roman military site. The material, dating from the first and second centuries AD, is some of the earliest Roman military equipment excavated in the Roman East, and the site is the only Roman military base of its period to ever have been explored in Turkey.