Feb 01, 2008. /Lesprom Network/. The board of directors of Koppers Holdings Inc. has increased the size of its board from seven to eight directors and elected former Pennsylvania Supreme Court Justice Cynthia A. Baldwin as a director of the company, effective February 1, 2008. Koppers is a global integrated producer of carbon compounds and treated wood products. Including its joint ventures, Koppers operates facilities in the United States, United Kingdom, Denmark, Australia, and China.