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Mr. Armstrong serves as a director of PAA GP Holdings LLC, which follows his retirement as CEO (October 2018) and Chairman (December 2019). Greg currently serves as Chairman of The Federal Reserve Bank of Dallas and is a director of Memorial Hermann Healthcare System and NOV Inc. He is a member of the adjunct faculty for the University of Oklahoma's Executive MBA in Energy program, the Advisory Board of the Cox School's Maguire Energy Institute at Southern Methodist University and is the immediate past Chairman of the National Petroleum Council.