Thomas H. Lee Partners is a full-service buyout firm. The comapny is one of the oldest private equity investment firms in the United States. Founded in 1974, it manages approximately $12 billion of capital. Thomas H. Lee Partners' notable transactions include Houghton Mifflin, TransWestern Publishing, National Waterworks, Endurance Specialty Insurance, Vertis, Eye Care Centers of America, Cott Corporation, United Industries, Rayovac, Fisher Scientific International, Experian, GNC and Snapple Beverage. The company is affiliated with TH Lee Putnam Ventures, which is a technology-focused private equity firm. TH Lee Putnam Ventures deals in the development and implementation of growth strategies for commercial and industrial businesses.