P. N. Singer is a Research Associate in the School of Historical Studies at the University of Newcastle. He wrote his doctoral thesis at the University of Cambridge on Galen's psychological works and researches and publishes on a range of areas in ancient Greek thought, in particular the interaction of medical and philosophical theories, concepts of the mind, works of practical ethics and ancient textual commentary. Further interests include ancient Greek drama, drama practice and classical Indian philosophy. His Galen: Selected Works (1997), in the Oxford World's Classics series, represented