Peter C. Whybrow, M.D., is a neuropsychiatrist and director of the Semel Institute for Neuorscience and Human Behavior at UCLA, or at least he was when he published American Mania: When More Is Not Enough in 2005. In the book he quotes numerous economic thinkers and writers from the last 300 years, including Adam Smith and Alexis de Tocqueville, as he analyzes how we behave in modern business.