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MarkWest Energy Partners Home Careers Media Relations Operations Customer Portal Contact Us Careers Working at MarkWest MarkWest is a wholly owned subsidiary of MPLX LP, a diversified, growth-oriented master limited partnership that was formed by Marathon Petroleum Corporation (MPC) to own, operate, develop and acquire midstream energy infrastructure assets. MPC operates an integrated refining, marketing and transportation system concentrated primarily in the Midwest, Northeast, East Coast, Southeast and Gulf Coast regions of the U.S. Click here to view all career opportunities at MPC, including MarkWest positions. Our Benefits Our outstanding array of employee benefits reflects our commitment to the health and financial well-being of our people. For more information on our benefits, please click here. MarkWest is an Equal Employment Opportunity (EEO) employer and does not discriminate in any employer/employee relations based on race, color, national origin, religion, gender, age, disability or veteran. © 2021 Copyright. MarkWest Energy Partners, L.P. All Rights Reserved. Privacy Policy Terms of Use Sitemap