Maryann T. Mannen
In late 2015, MPLX (i.e., Marathon Petroleum) bought out and merged in the Utica Shale’s premier midstream company, MarkWest Energy, for $15 billion (see MarkWest Energy Investors/Unitholders Approve Merger with Marathon). The “new” MarkWest, aka MPLX, plays on a much larger stage now, including ownership and operation of major assets in the Permian Basin and in the Bakken Shale, in addition to the Marcellus/Utica. Big news: MPLX CEO Mike Hennigan is stepping back and will be succeeded by Maryann T. Mannen, currently President of Marathon Petroleum.
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