Roy Porter
Roy's books cover several fields: the history of geology, London, 18th-Century British ideas and society, medicine, madness, quackery, patients and practitioners, literature and art, on which subjects (and others) he published over 200 books are articles.
List of works can be found @ wikipedia ( http://en.wikipedia.org/wiki/Roy_Porter )
“Not least, the asylum idea reflected the long-term cultural shift from religion to scientific secularism. In traditional Christendom, it was the distinction between believers and heretics, saints and sinners, which had been crucial—that between the sane and the crazy had counted for little. This changed, and the great divide, since the ‘age of reason’, became that between the rational and the rest, demarcated and enforced at bottom by the asylum walls. The keys of St Peter had been replaced by the keys of psychiatry.”
Roy Porter