- Prior to his retirement in 2016, served as Executive Vice President and Chief Operating Officer for MarkWest operations of MPLX GP LLC
- In 2002, was on of five founders of MarkWest Energy Partners, LP, and until 2015, served as Executive Vice President and Chief Operating Officer
- From 1996 to 2002, worked in various senior management roles for MarkWest Hydrocarbon, Inc
- From 1982 to 1996, worked for ARCO Oil and Gas Company in various roles in engineering and operations
- Served as a director of the general partner of Antero Midstream Partners LP beginning in April 2017 through the closing of the Simplification Transactions
John C. Mollenkopf
Director
