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Andrew Lesniewski is a Professor of Mathematics at Baruch College in New York City and a faculty member of Baruch's MFE program. He is also President of Posnania Inc, a financial engineering and risk management advisory and consulting firm. He is an expert in quantitative finance and financial engineering, and has extensive industrial experience in quantitative research and modeling, trading, and risk management. He has pioneered a number of methodologies for securities valuation and risk management that are widely used by the financial industry. Prior to joining the faculty of Baruch in August 2013, Andrew was the Head of Financial Engineering at the Depository Trust & Clearing Corporation, the world's largest clearing house. Until the end of 2011 he was the Head of Quantitative Research at Ellington Management Group, a multibillion dollar hedge fund in Greenwich, CT. Prior to that, he was the Head of FIRST, the quantitative fixed income research and modeling team, in the New York office of BNP Paribas. He also worked there as a trader in charge of a number of portfolios of structured interest rate derivatives. Until June 2013, Andrew was an Adjunct Professor at the Courant Institute of the Mathematical Sciences at NYU. Before moving to finance in 1997, he was on the faculty of Harvard University. Andrew holds a PhD in Mathematics from the Swiss Federal Institute of Technology in Zurich, Switzerland.