BOARD OF DIRECTORS

Brian L. Derksen
Vice Chair, Audit Committee; Corporate Governance Committee member
Retired Global Deputy Chief Executive Officer, Deloitte Touche Tohmatsu Limited
Dallas, Texas

Julie H. Edwards
Chair, Corporate Governance Committee
Former Chief Financial Officer, Southern Union Company;
Former Chief Financial Officer, Frontier Oil Corporation
Houston, Texas

John W. Gibson
Chairman of the Board and Retired Chief Executive Officer, ONEOK, Inc.
Tulsa, Oklahoma

Randall J. Larson
Chair, Audit Committee
Retired Chief Executive Officer, TransMontaigne Partners L.P.
Tucson, Arizona

Steven J. Malcolm
Executive Compensation and Corporate Governance committees member
Retired Chairman, President and Chief Executive Officer, The Williams Companies, Inc.
Tulsa, Oklahoma

Jim W. Mogg
Audit; Corporate Governance committees member
Retired Chairman, DCP Midstream GP, L.L.C.
Hydro, Oklahoma

Pattye L. Moore
Chair, Executive Compensation Committee
Chairman, Red Robin Gourmet Burgers;
Former President, Sonic Corp.
Broken Arrow, Oklahoma

Gary D. Parker
Audit; Corporate Governance committees member
President, Moffitt, Parker & Company, Inc.
Muskogee, Oklahoma

Eduardo A. Rodriguez
Vice Chair, Executive Compensation and Corporate Governance committees member
President, Strategic Communications Consulting Group
El Paso, Texas

Terry K. Spencer
President and Chief Executive Officer, ONEOK, Inc.
Tulsa, Oklahoma

OFFICERS

Ages as of February 27, 2018

Terry K. Spencer, 58
President and Chief Executive Officer

Robert F. Martinovich, 60
Executive Vice President and Chief Administrative Officer

Walter S. Hulse III, 54
Chief Financial Officer and Executive Vice President,
Strategic Planning and Corporate Affairs

Kevin L. Burdick, 53
Executive Vice President and Chief Operating Officer

Stephen B. Allen, 44
Senior Vice President, General Counsel and Assistant Secretary

Wesley J. Christensen, 64
Senior Vice President, Operations

Derek S. Reiners, 46
Senior Vice President, Finance, and Treasurer

Sheridan C. Swords, 48
Senior Vice President, Natural Gas Liquids

Charles M. Kelley, 59
Senior Vice President, Natural Gas

Sheppard F. Miers III, 49
Vice President and Chief Accounting Officer

Eric Grimshaw, 65
Vice President, Associate General Counsel and
Corporate Secretary