today is, by one estimate, a $20-billion-a-year indus- try. As a professional field, it is also unkempt and overgrown, with no regular boundaries. Practitioners cannot always agree on which forms of treatment "work" and which do not. And yet, ironically, in its broader social impact, psychiatry's intellectual disarray has long been irrelevant. Here, in a five-part essay, psy- chiatrist and neurologist Richard Restak surveys the state of the profession and its unusual role in American...