Chesapeake Energy names Martin as new chairman

• Chesapeake Enegy (NASDAQ:CHK) appoints R. Brad Martin as non-executive chairman of the board effective immediately, replaces Archie Dunham, who will retain his board seat and serve as Chairman Emeritus.
• Martin, Chairman of RBM Ventures and retired chairman of Saks, joined CHK's board in 2012.
• CHK was one of the day's worst performers on the S&P 500, -7.3%, as energy companies ended broadly lower.