Greg Nielsen joined Ontario Teachers' in 2007. He has worked on a number of investments in the financial services sector, including GCAN Insurance Company, Canada Guaranty Mortgage Insurance Company, BroadStreet Partners, NXT Capital, First American Payments, APCO Holdings, Catalina Holdings (Bermuda) and Kanetix. Greg currently serves on the boards of BroadStreet Partners, APCO Holdings, and Kanetix.

Previously, he worked in the mergers and acquisitions group at TD Securities and the corporate lending division at Canadian Western Bank.

Greg received a Bachelor of Commerce from the University of Alberta and an MBA (Honours) from the Rotman School of Management at the University of Toronto.