Valerie J. Sill, CFA, CAIA is president and CEO of DuPont Capital Management (DCM) and serves as DCM's chief investment officer. She is responsible for overseeing the investment of more than $25 billion in assets held by DuPont Company plans and external clients. DCM manages assets across nine different asset classes using a value-based investment approach that combines valuation and risk control disciplines designed to produce risk-efficient excess returns that satisfy its clients’ investment objectives. Prior to joining DCM in April 2004, Ms.