Emanuel Derman is a South African-born academic,[1] businessman and writer. He is best known as a quantitative analyst, and author of the book My Life as A Quant: Reflections on Physics and Finance.[2] He is a co-author of Black-Derman-Toy model, one of the first interest-rate models, and the Derman-Kani local volatility or implied tree model, a model consistent with the volatility smile. He is currently a professor at Columbia University[3] and Director of its program in financial engineering, and is also the Head of Risk and a partner at Prisma Capital Partners, a fund of funds. His book My Life as A Quant: Reflections on Physics and Finance, published by Wiley in September 2004, was one of Business Week's top ten books of the year for 2004.[4] In 2011, he published "Models Behaving Badly," a book contrasting financial models with the theories of hard science, and also containing some autobiographical material. [Free Press, 2011]