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Geoffrey founded two hospitals in Berkhamsted, one dedicated to St John the Baptist and one to St John the Evangelist; the latter is still commemorated in the town with the name St John's Well Lane.
He has held fellowships in History of Medicine at the University of Minnesota (1971–73) and at University College London (1974), before moving in 1974 to the Department of History of Science and Technology, UMIST, Manchester, to work on the history of hospitals in the Manchester region (Lecturer, 1977, later Senior Lecturer).