David C. Lawler, CEO of BPX Energy, has been appointed chairman and president of BP Amer­ica Inc. He will succeed Susan Dio, who will step down and retire after 36 years with the company.

Weatherford International Plc President and CEO Mark A. McCollum has left the company. The board of directors has initiated a search to identify a permanent re­placement for McCollum. In the in­terim, COO Karl Blanchard and CFO Christian Garcia will form the office of the chief executive, reporting directly to the board of directors and will oversee the day-to-day operations.

Steve Greenlee has retired as pres­ident of Exxon Mobil Upstream Business Development Co. He will be succeeded by Linda DuCharme, who will also retain her current po­sition as president of Exxon Mobil Upstream Integrated Solutions Co. Additionally, DuCharme has been elected as vice president of Exxon Mobil Corp.

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