Emanuel Derman is a principal and Head of Risk at Prisma Capital Partners and a professor and Director of the Program in Financial Engineering at Columbia University. He was formerly a managing director at Goldman, Sachs & Co., which he joined in 1985 after an initial career in academic life and at AT&T Bell Laboratories. He is the co-creator of the widely used Black-Derman-Toy interest rate model and the Derman_Kani local volatility model. Among his many awards and honors, he was named the SunGard/IAFE Financial Engineer of the Year in 2000 and was appointed to the Risk Hall of Fame in 2002. He has a PhD in theoretical physics from Columbia University and is the author of numerous articles in elementary particle physics, computer science, and finance.