Gregory Floerke

Executive Vice President and Chief Operating Officer, MPLX GP LLC Marathon Petroleum

Last Reviewed: October 1, 2026

Executive Summary

Gregory Floerke is Executive Vice President and Chief Operating Officer of MPLX, the midstream company controlled by Marathon Petroleum, and is one of Marathon Petroleum’s designated executive officers. He has held the MPLX operating role since February 2021. He joined the group when it acquired MarkWest Energy Partners in December 2015, where he had been chief commercial officer, and went on to run MarkWest operations and then gathering and processing. Marathon Petroleum ranked No. 30 on the 2026 Fortune 500.

Career Highlights

• Executive Vice President and Chief Operating Officer of MPLX since February 2021.
• Executive Vice President Gathering and Processing, MPLX, from 2018.
• Executive Vice President and Chief Commercial Officer of MarkWest from 2015.
• Senior Vice President, Northeast Region, MarkWest, from 2013.

Professional Journey

Floerke held senior management positions at Access Midstream Partners from 2011 to 2013. He joined MarkWest Energy Partners in 2013 as Senior Vice President for the Northeast Region and became its Executive Vice President and Chief Commercial Officer in 2015.

After the MarkWest acquisition in December 2015 he was Executive Vice President and Chief Commercial Officer of MarkWest Assets, then from 2017 Executive Vice President and Chief Operating Officer of MarkWest Operations, and from 2018 Executive Vice President of Gathering and Processing.

In February 2021 he became Executive Vice President and Chief Operating Officer of MPLX. He is a member of the board of TransTech Group.

Education

No first-party source read for this profile states his education.