"Stephen has been involved with Foundation Coal through the acquisition and initial public offering of the company in 2004. His knowledge and background make him a welcome addition to the board," said Foundation president and chief executive officer, James F Roberts.

Ko has been an associate in the Private Equity Group of investment and advisory firm The Blackstone Group since 2002. He has also held positions at Clayton, Dubilier & Rice, a private equity firm, and the Investment Banking Division of Goldman, Sachs & Co. Ko currently serves as a member of the Advisory Committee of Graham Packaging Holdings Company.

Ko received both a bachelor of arts degree and a masters degree in business administration from Harvard University. He also earned his masters of philosophy from the University of Cambridge (England).