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Ms. Edwards served as Senior Vice President of Corporate Development of Southern Union Company from November 2006 to January 2007, and immediately prior to that served as its Senior Vice President and Chief Financial Officer from July 2005 to November 2006. Southern Union is primarily engaged in the transportation and distribution of natural gas. Prior to joining Southern Union, Ms. Edwards served as Executive Vice President—Finance and Administration and Chief Financial Officer for Frontier Oil Corporation in Houston from 2000 until July 2005. She joined Frontier Oil in 1991 as Vice President— Secretary and Treasurer after serving as Vice President of Corporate Finance for Smith Barney, Harris, Upham & Co., Inc., New York and Houston, from 1988 to 1991, after joining the company as an associate in 1985. Ms. Edwards has not held a principal employment since retiring from Southern Union in 2007. Ms. Edwards is also a director of ONEOK, Inc., and served as a director of ONEOK Partners GP, L.L.C. until its acquisition by ONEOK, Inc. in June 2017. Ms. Edwards served as a director of the NATCO Group, Inc. from 2004 until its merger with Cameron International Corporation in 2009. Ms. Edwards brings to our Board experience in finance and senior management positions for multiple energy companies and experience as a director of several public companies.