Management

Sid McAnnally is president and chief executive officer of ONE Gas and a member of the ONE Gas Board of Directors.

McAnnally joined the company in 2015 as senior vice president of operations, responsible for the operation of its three natural gas utilities – Kansas Gas Service, Oklahoma Natural Gas and Texas Gas Service. He was promoted to chief operating officer in 2020, assuming additional responsibilities for the company’s administrative functions, including human resources, cybersecurity and information technology, and was named president and chief executive officer in June 2021.

Before joining ONE Gas, McAnnally was an officer of Energen Corporation, serving first as vice president of external affairs and strategic planning, then as senior vice president of customer service and marketing for its utility subsidiary, Alagasco. Before joining Energen, McAnnally practiced law, representing clients in the utility, financial and corporate sectors.

McAnnally serves as first vice chair on the Board of Directors and the Executive Committee of the American Gas Association and is a past Chair of the Board of Trustees of the American Gas Foundation. Additionally, he is a member of the National Petroleum Council, an advisory organization to the Secretary of Energy in Washington, D.C. McAnnally is also involved in several other industry associations and charitable organizations.

McAnnally holds a Juris Doctorate from the University of Alabama and a Bachelor of Arts degree from Auburn University. He has also attended the Executive Education Program at the Harvard Business School, where he serves as a guest lecturer in the crisis management program.

Christopher P. Sighinolfi is senior vice president, chief financial officer, of ONE Gas. His responsibilities include the oversight of the company’s finance function, including accounting, tax, treasury, financial planning and analysis, investor relations and audit services.

Sighinolfi joined the company in 2021 as vice president, corporate development. In his role, he was responsible for identifying and evaluating business investment opportunities, including asset acquisitions and divestitures, market development, and customer programs and services. He also oversaw the company’s investor relations and sustainability efforts.

Before joining ONE Gas, he served as managing director of U.S. Equity Research for Jefferies Financial Group and was responsible for coverage of natural gas utilities, midstream companies, independent U.S. refiners and energy Master Limited Partnerships. Prior to his role at Jefferies, he served as director of U.S. Investment Research at UBS Investment Bank.

Sighinolfi is a trustee of the Mount Desert Island Biological Laboratory.

He is a CFA Charterholder and holds a bachelor’s degree in philosophy, politics and economics from the University of Pennsylvania, where he graduated with distinction.

Curtis L. Dinan is senior vice president and chief operating officer of ONE Gas.

He is responsible for safety, operations and commercial for the company’s three natural gas distribution utilities – Oklahoma Natural Gas Company, Kansas Gas Service and Texas Gas Service.

In 2014, at ONE Gas’s separation from ONEOK, Inc. into a standalone, publicly traded company, Dinan was named senior vice president and chief financial officer. He was promoted to senior vice president and chief commercial officer in 2019 and to his current role in 2021.

Prior to the separation from ONEOK, he served as president, natural gas, of ONEOK Partners, responsible for the commercial activities in its natural gas gathering and processing and natural gas pipelines segments. Before that, Dinan was senior vice president, chief financial officer and treasurer of ONEOK and ONEOK Partners from 2007 to 2011. He served on the ONEOK Partners Board of Directors from October 2007 to March 2011. He joined ONEOK in 2004 as vice president and chief accounting officer after being an audit partner with both Arthur Andersen LLP and Grant Thornton LLP.

Dinan is a member of the board of directors and chair of the audit committee of Paul Mueller Company (OTC-MUEL), a manufacturer of equipment and components for the food, dairy, beverage, chemical and pharmaceutical industries headquartered in Springfield, Missouri. He is a member of the board of trustees for Drury University and the board of directors for Tulsa Community College Foundation. He is also a past chair of the finance committee for the American Gas Association and has served on the boards of directors for the Interstate Natural Gas Association of America and the Texas Pipeline Association. He is a graduate of Leadership Oklahoma Class 20 and Leadership Tulsa Class 24.

Dinan earned Bachelor of Arts degrees in accounting and business administration in 1989 from Drury University, where he was named a Distinguished Alumnus for Career Achievement. He also is a graduate of Harvard Business School’s Advanced Management Program.

Joe McCormick is senior vice president, general counsel and assistant secretary of ONE Gas, responsible for legal matters of its three natural gas distribution utilities – Oklahoma Natural Gas Company, Kansas Gas Service and Texas Gas Service.

Prior to ONE Gas becoming a stand-alone, publicly traded company separate from ONEOK Inc., he served as vice president and associate general counsel of ONEOK in a similar capacity. McCormick joined ONEOK in 2003 as the managing attorney of Oklahoma Natural Gas. Prior to that, he served as an assistant attorney general with the Oklahoma attorney general’s office and as an assistant general counsel with the Oklahoma Insurance Department.

He is a member of the American Gas Association legal committee and previously served as the chairman of the executive committee of the legal committee. He is also a member of the Oklahoma Bar Association and the Association of Corporate Counsel.

McCormick is a graduate of Leadership Tulsa – Class 46. He has also served as a board member of the Oklahoma Individual Self-Insured Guaranty Fund, the Oklahoma Academy, the Urban League of Greater Oklahoma City, Oklahoma Lawyers for Children, the Lyric Theatre, the Oklahoma Huntington Disease Society and the Metropolitan Tulsa Urban League.

A native of California, McCormick earned a Bachelor of Arts degree in public administration in 1984 from the University of Central Oklahoma in Edmond and a Juris Doctorate in 1987 from the University of Oklahoma College of Law in Norman.

Mark Bender is senior vice president, administration, and chief information officer of ONE Gas. His responsibilities include information technology, cyber and physical security, process and data integrity, and enterprise services.

Bender joined ONE Gas in 2014 as vice president and chief information officer. Prior to ONE Gas, Bender was vice president of business systems for Chesapeake Energy in Oklahoma City, where he also served as vice president of information technology operations. There, he was responsible for managing traditional infrastructure services and creating innovative technology solutions. Bender also served as chief information officer at both Oral Roberts University and Williams Communications.

He began his career in the natural gas industry in 1987 in the information technology group for Source Gas, a natural gas distribution company in Fayetteville, Arkansas. He then joined Ernst & Young as a management consultant specializing in the energy and insurance markets before returning to his hometown of Tulsa to join Williams Companies in 1993.

He previously served on the Hewlett-Packard Board of Advisors, the University of Oklahoma’s Computer Science Board of Advisors, the City of Tulsa Information Technology Advisory Council and the Board of Directors for A New Leaf.

A Tulsa native, Bender earned a Bachelor of Science in management information systems in 1987 from the University of Tulsa.

Regina L. Gregory is senior advisor to the chief executive officer of ONE Gas, preparing to lead the company's legal matters and compliance efforts as senior vice president, general counsel and assistant corporate secretary effective October 1, 2025.

She is a seasoned energy industry executive with extensive experience across public and private sectors. Prior to ONE Gas, Gregory served as executive vice president, general counsel and corporate secretary of Targa Resources Corp. Her professional journey also includes significant roles at Frontier Energy Services, LLC, American Midstream Partners, L.P., Traverse Midstream Partners LLC, and Access/Chesapeake Midstream Partners, L.P.

Throughout her career, Gregory has led legal departments and compliance efforts, facilitated major acquisitions and divestitures, managed senior notes and equity offerings, directed complex litigation, developed sustainability strategies, and played critical roles in government affairs and human resources. She is skilled in navigating complex corporate governance and legal challenges, regulatory matters and driving business growth while limiting legal risk. 

Gregory holds a Juris Doctor (JD) with Highest Honors from the University of Oklahoma College of Law and a B.S. in Business/Marketing with a minor in Finance from the University of Colorado, graduating Magna Cum Laude. She is a member of the Oklahoma and Texas Bar Associations.

She is a member of the Choctaw Nation and serves on the Board of Managers of Choctaw Global, whose mission is to provide additional revenue to support Choctaw Nation service programs for its tribal members.

Angela E. Kouplen is senior vice president, chief human resources officer of ONE Gas. Her responsibilities include the oversite of the company's human resources functions including benefits, talent management and inclusion and diversity.

Before joining the company in 2023, Kouplen served as vice president of administration and chief information officer at The University of Tulsa. Before joining TU, she was responsible for human resources, executive compensation, information technology, real estate and facilities for WPX Energy. Before that, she worked in information technology with Williams and CITGO. Her roles have included managing IT planning and governance, third-party applications and applications development, e-business strategy as well as sourcing..

Kouplen has served on a variety of nonprofit boards and committees supporting the Tulsa area community including YWCA, Resonance Center for Women and the Tulsa Area United Way Women’s Leadership Council. She currently serves on the Tulsa Regional STEM Alliance Board of Directors, Junior Achievement of Oklahoma Tulsa Region Board of Directors, the Oklahoma State University Alumni Association Board of Directors and TU’s Collins College of Business Executive Advisory Board.

Kouplen received a Bachelor of Science degree in Management with a minor in management information systems from Oklahoma State University and a Master of Business Administration from The University of Tulsa.

Kent Shortridge is senior vice president of operations and customer service of ONE Gas. ONE Gas provides natural gas distribution services to more than two million customers in Oklahoma, Kansas and Texas.

Previously, he served as managing vice president of operations of ONE Gas. Prior to ONE Gas becoming a stand-alone, publicly-traded company separated from ONEOK, Inc., he served as vice president of operations for Oklahoma Natural Gas.

Shortridge joined ONEOK in 1990 as a field engineer and has held various positions of increasing responsibility. He was vice president of Oklahoma Natural Gas Company’s Eastern Region, where he managed and oversaw operations. Prior to that, as president of natural gas pipelines of ONEOK Partners, he was responsible for interstate and intrastate natural gas pipelines and storage. He also has held the position of vice president of natural gas supply and administration of ONEOK’s natural gas distribution segment at the time – Oklahoma Natural, Kansas Gas Service and Texas Gas Service – and vice president, commercial, of ONEOK Partners’ intrastate pipelines and storage assets.

Active in the community and industry, Shortridge is a graduate of Leadership Oklahoma – Class XV and has served on various nonprofit boards in the communities where he has lived. He currently serves on the executive board of the Greater Oklahoma City Chamber of Commerce. He is a senior member of the College of Industrial Engineering Advisory Board for the University of Oklahoma. He serves on the Leadership Council for the American Gas Association and is a past board member of the Southern Gas Association and the Texas Pipeline Association.

A native of California, Shortridge earned a Bachelor of Science degree in industrial engineering in 1990 from the University of Oklahoma in Norman and a Master of Business Administration degree in 1997 from Oklahoma State University in Stillwater.

Julie White is vice president of communications at ONE Gas. White is responsible for the development and implementation of the company’s overall communications strategy, providing counsel to the top leaders and working collaboratively to enhance the company’s image with employees, customers, regulators and shareholders. White leads the company’s internal and external communications that drive stakeholder understanding, acceptance, perception and trust. She also oversees the company’s philanthropic efforts including the ONE Gas Foundation, community investments, employee volunteerism and matching grant programs.

Before joining ONE Gas in 2018, she served as vice president, corporate communications for Berkshire Hathaway Energy, a global energy company consisting of several locally managed businesses with more than 21,000 employees.

White serves on the board of directors of New View Oklahoma, a nonprofit organization that seeks to empower individuals who are blind or have low vision, maximizing their opportunities for independence through all stages of life. She is a member of the board of directors of the Tulsa Regional Chamber and currently leads a communications industry group for the Southern Gas Association. She is a graduate of Leadership Oklahoma Class 33.

White holds a bachelor’s degree in business administration with an emphasis in marketing from Iowa State University, where she graduated with distinction.