In 1965 he completed his PhD thesis "Neolithic and Bronze Age cultures of the Cyclades and their external relations" and in the same year married Jane M. Ewbank.
No 1965 defendeu a súa tese de doutoramento: Neolithic and Bronze Age cultures of the Cyclades and their external relations ("As culturas neolíticas e da Idade de Bronce das illas Cícladas e as súas relacións externas") e casou con Jane M. Ewbank.