Williams Companies (WMB) COO Micheal Dunn will retire in May, the company said on March 13.

Dunn has served as COO since 2017, overseeing some of the midstream giant’s major infrastructure projects, such as the Regional Energy Access project in the Mid-Atlantic.

“I am proud of what we have accomplished together but the time is right for me to retire, knowing the team is well-positioned to continue delivering great results for customers and shareholders,” Dunn said in a press release.

Dunn began his career with Williams in 1988 and spent 14 years with the company in its gas pipeline business before transitioning to leadership roles at Kern River and PacificCorp Energy. Prior to rejoining Williams in 2017, Dunn served as president of Questar Pipeline and executive vice president of Questar Corporation.

Williams’ leadership credited Dunn for his focus on regulatory compliance, optimizing the company’s assets to enhance Williams’ overall competitive advantage and advancing the company’s focus on natural gas.

“During his tenure, Micheal transformed our organization from operating as distinct business units into one cohesive, best-in-class operating company. He has brought strong operational discipline and an unwavering commitment to safety across the entire organization,” said Alan Armstrong, president and CEO of Williams.