Alan Armstrong is the Executive Chairman of the Board of Directors at Williams Companies, a leading provider of energy infrastructure in North America. Appointed to the role in July 2025, Armstrong transitioned from his long-standing position as president and CEO, a role he held since 2011. As Executive Chairman, Armstrong continues to guide Williams' long-term vision and governance, supporting the company's mission to deliver clean, reliable, and affordable energy while advancing innovation and sustainability in the energy sector. Under his leadership, Williams became a dominant force in the natural gas sector, now handling approximately a third of all U.S. natural gas volumes.

Armstrong led Williams through a period of strong growth and strategic expansion, driven by successful execution on major pipeline projects, disciplined financial management and capitalizing on favorable market trends in natural gas demand. Armstrong was instrumental in shaping the company’s natural gas-focused strategy, significantly expanding its transmission, storage, gathering and processing infrastructure.

Prior to being named CEO of Williams, Armstrong led the company's North American midstream and olefins businesses through a period of growth and expansion as Senior Vice President – Midstream. He also served in a number of operational and commercial roles in various business units at Williams. Armstrong began his career at Williams nearly four decades ago as an engineer and steadily rose through the ranks, demonstrating a deep commitment to operational excellence, strategic growth and environmental stewardship.

Armstrong is the former Chair of the National Petroleum Council and is a founding member of Natural Allies for a Clean Energy Future. He serves as Chair of the Board of Trustees for the University of Oklahoma Foundation and is a board member for BOK Financial Corp. In addition, he is the former Chair of Junior Achievement USA. Armstrong earned his bachelor's degree in civil engineering from the University of Oklahoma.