. "Derman, Emanuel"@en . . . . . "Emanuel Derman"@en . . . . . . . "Emanuel Derman is a South African-born academic, 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.He is a co-author of Black\u2013Derman\u2013Toy model, one of the first interest-rate models, and the Derman\u2013Kani local volatility or implied tree model, a model consistent with the volatility smile.Derman, who first came to the U.S."@en . "South African economist" .