Emanuel Derman is a professor at Columbia University, where he directs their program in financial engineering. He was born in South Africa but has lived most of his professional life in Manhattan. He started out as a theoretical physicist, doing research on unified theories of elementary particle interactions. At AT&T Bell Laboratories in the 1980s he developed programming languages for business modeling. From 1985 to 2002 he worked on Wall Street where he co-developed the Black-Derman-Toy interest rate model and the local volatility model. He is the author of The Volatility Smile (Wiley, 2017), Models.Behaving.Badly (Free Press 2011) one of Business Week’s top ten books of 2011. He is also the author of My Life As A Quant (Wiley 2004), also one of Business Week’s top ten of 2004, in which he introduced the quant world to a wide audience.