William G. De Leon is a managing director in the Newport Beach office and global head of portfolio risk management. He previously served as a portfolio manager focusing on derivatives and absolute return strategies as well as interim head of analytics. He represents PIMCO on the board of ISDA and serves on PIMCO's risk committee and counterparty risk committee. Prior to joining PIMCO in 2007, he was a portfolio manager at Ellington Management Group, an investment management firm specializing in fixed income relative value trades. Previously, he was a managing director and a senior member of the investment strategy group at BlackRock. He has 24 years of investment experience and holds an undergraduate degree from the University of Pennsylvania.