Manifold will join the BP board on Sept. 1 and take over as chairman on Oct. 1, the company said in a statement Monday. He succeeds Helge Lund, who said in April he would step down from the role.

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Chevron Corp. has prevailed in a 20-month fight to buy Hess Corp. for $53 billion, overcoming a challenge by arch rival Exxon Mobil Corp. that was unprecedented in the modern history of Big Oil.