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 will proceed with its $53 billion acquisition of Hess, after it prevailed in a landmark legal battle against larger rival Exxon Mobil to gain access to the largest oil discovery in decades.