Hewitt Investment Group was an investment consulting firm based at Lincolnshire, Illinois. Founded in 1974, the firm provided services such as development of investment policies, asset allocation and asset liability studies, investment manager evaluation and selection, performance measurement and monitoring, analysis of alternative investments and research services. Hewitt Investment Group, Ennis, Knupp & Associates, and Aon Investment Consulting merged together to form Hewitt EnnisKnupp.