"The history of Cushing's disease now goes back quite a long time. Yet no clear cut definition of the issues involved has emerged. The pathogenesis of the
condition is still controversial.
Harvey Cushing (1869-1939) was one of the most outstanding surgeons of the present century and, as Garrison put it, 'facile princeps in neurological
surgery, particularly surgery of the head and the pituitary body'..."
Read this interesting PDF here: http://www.cushings-help.com/downloads/history_of_cushings.pdf