In 1970 he left the priesthood because he could not preach against the use of birth control, the banning of which was outlined by Pope Paul VI in his encyclical Humanae Vitae in 1968.
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He received an MA from the University of Melbourne and a PhD from Harvard University, where his doctoral dissertation was a historical ethnography of the Marquesas Islands.
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Among the staff Crawford employed and encouraged were Manning Clark, Geoffrey Blainey, Greg Dening, John La Nauze, John Poynter, Margaret Kiddle and Kathleen Fitzpatrick - several of these also studied under Crawford.