Before founding MAC Energy Group companies in 2010, McKibben served as Managing Director and Head of Environmental Banking Strategy for Citigroup Global Markets. She also served as Director of European Economic Affairs and European Union Relations and Acting Senior Director for European Affairs on the National Security Council at the White House, as well as in various senior advisory roles within the U.S. Department of Commerce. Prior to her work in the public sector, she practiced law at Akin, Gump, Strauss & Feld LLP, representing and advising clients on commercial and complex litigation matters, as well as corporate and multinational energy clients on global strategic investments.

She currently serves as a director of Ecolab Inc. where she is a member of the Governance Committee and Compensation and Human Capital Management Committee. She also serves on the Board of Directors of the United Services Automobile Association, a financial services company. She also serves on the Board of Directors of the National Kidney Foundation and the Board of Governors of West Virginia State University. She is a life member of the Council on Foreign Relations, serving on the Membership Committee.

McKibben received a bachelor of arts degree from West Virginia State University and a juris doctorate from Harvard Law School.