He is a Principal Investigator on the Dakhleh Oasis Project, co-ordinating the study of the ceramics ranging in date from the sixth millennium BCE to the Mamluk Period, and directs the excavations at Ismant al-Kharab and Mut al-Kharab. Since 1973, he has undertaken research into the blue-painted pottery of the New Kingdom and studied the large collections from the early excavations at Amarna and those from Karnak North, Malkata and Kom Rabia, plus many other smaller ones.