Emanuel Derman of Columbia University and author of Models. Behaving. Badly talks with EconTalk host Russ Roberts about theories and models, and the elusive nature of truth in the sciences and social sciences. Derman, a former physicist and Goldman Sachs quant [quantitative analyst], contrasts the search for truth in the sciences with the search for truth in finance and economics. He critiques attempts to make finance more scientific and applies those insights to the financial crisis. The conversation closes with a discussion of career advice for those aspiring to work in quantitative finance.