Founded in 2003, Glass, Lewis & Co., LLC is a leading research and professional services firm that assists institutions globally that have investment, financial or reputational exposure to public companies. Glass Lewis provides research and analysis on more than 16,000 public companies based in 65 countries around the world. In 2007 Glass Lewis became an independent wholly-owned subsidiary of Ontario Teachers' Pension Plan Board.

Glass Lewis was founded by Wall Street professionals to assist institutional investors and other institutional participants in the capital markets. The firm was capitalized by its founders and a group of research analysts, accountants, publishers and bankers.

The firm employs more than 100 people in six offices, including its headquarters in San Francisco. Glass Lewis serves several hundred institutional clients on three continents.