<|im_start|>user
Where did David Leatherbarrow receive his PhD from?

Context:
David Leatherbarrow is Professor of Architecture and Chair of the Graduate Group in Architecture at the University of Pennsylvania School of Design, Philadelphia, where he has taught since 1984. He received his B.Arch. from the University of Kentucky and holds a Ph.D. in Art from the University of Essex. He has also taught in England, at Cambridge University and the University of Westminster (formerly the Polytechnic of Central London).<|im_end|>
<|im_start|>assistant
University of Essex<|im_end|>
