His approach, as director of Ancient Egypt Research Associates (AERA), is to conduct interdisciplinary archaeological investigation.[1] Every excavated object is examined by specialists to create an overall picture of an archaeological site—from the buildings down to the pollen spores. His international team currently runs the Giza Plateau Mapping Project, excavating and mapping the ancient city of the builders of the Giza pyramid complex, which dates to the fourth dynasty of Egypt. He discovered that Pyramid G1-a, one of the subsidiary pyramids of the Great Pyramid, belonged to Hetepheres I; it was originally thought to belong to Queen Meritites I.