Oilfield services company Schlumberger Ltd. (NYSE: SLB) has appointed shale pioneer Mark Papa and energy researcher Tatiana Mitrova to its board of directors, according to a filing on Aug. 6 with the U.S. Securities and Exchange Commission.

Papa, who built independent energy producer EOG Resources Inc. (NYSE: EOG) into one of the most profitable U.S. shale companies, currently heads Centennial Resource Development Inc. (NASDAQ: CDEV).

His appointment comes just a few months after Helge Lund, former CEO of BG Group and Statoil ASA, resigned from the Schlumberger board in April to become chairman of BP Plc (NYSE: BP).

Mitrova is the director of the Energy Center at the Moscow School of Management, according to her LinkedIn profile. She has held other research and policy positions, including at the Center for Global Energy Policy and the Oxford Institute for Energy Studies.

Schlumberger did not immediately respond to a request for comment.