Marathon Petroleum Corp. said March 18 it will retain its midstream unit and tapped the business’ head as its new CEO, concluding a strategic review driven by shareholder demands for its separation.

Michael J. Hennigan, the head of MPLX LP, was appointed by Marathon to serve as its next president and CEO, replacing Gary R. Heminger, who will retire in April after a 45 year-long career at the company.

Heminger’s departure had been announced last October as part of the launch of a restructuring by Marathon Petroleum, the largest independent refiner in the U.S. The restructuring included a strategic review of midstream business unit MPLX and followed demands made by shareholder Elliott Management for Marathon to split its business into three separate companies.

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