Christopher Daniel Pappas is a special advisor to the CEO of Trinseo S.A., a Berwyn-based global materials company that manufactures plastics, latex, and synthetic rubber, among others. Pappas previously served as the company's president and chief executive officer, beginning in June 2010 when the Dow Chemical Company sold a group of its businesses and assets to Bain Capital under the name Styron (later renamed Trinseo). Pappas retired from the position of CEO as of March 4, 2019.