Exxon Mobil Corp. said June 1 that long-serving executive Steve Greenlee will retire by the end of the month after more than 38 years with the Irving, Texas-based oil major.

Greenlee, who worked in several Exxon and ExxonMobil affiliates throughout his decades-long career, most recently served as president of ExxonMobil Upstream Business Development Co. He had previously served as president of ExxonMobil Exploration Co. prior to a reorganization of Exxon Mobil’s upstream business in 2019.

In conjunction with Greenlee’s retirement, Linda DuCharme was appointed as his successor as well as being elected vice president of Exxon Mobil Corp. In addition to her new role as president of ExxonMobil Upstream Business Development, DuCharme will retain her current position as president of ExxonMobil Upstream Integrated Solutions Co.

The reorganization of Exxon Mobil’s upstream business in 2019 resulted in the creation of three new upstream companies. Liam Mallon currently serves as president of the third upstream company—ExxonMobil Upstream Oil & Gas Co.

DuCharme joined Exxon Co. USA in 1986 and spent her early career in engineering and project management for production operations in the Gulf of Mexico. She subsequently had assignments in the U.S. and Europe in business development and marketing. In 2016, she was appointed president of ExxonMobil Global Services Co.