In a freshly-filed 13D with the SEC, Mark Rachesky 's MHR Fund Management revealed that the Board of Directors of Key Energy Services Inc. elected Mark Rosenberg, who acts as principal of Fund Management, to serve as the non-executive Chairman of the company's Board. The public filing also indicates that MHR Fund Management held its position in Key Energy unchanged at 17.48 million shares, which represent 11.1% of the company's outstanding common stock.