Shell Oil last Tuesday announced a series of changes to the makeup of its U.S. leadership team.

Following a 36-year career with the company, EVP Unconventionals, Greg Guidry, will leave his role on June 31, 2018.

Guidry will be succeeded by Gretchen Watkins, former CEO of Maersk Oil, who will officially join Shell on May 1, 2018, and will be appointed EVP Unconventionals effective July 1, 2018. She will report to the Upstream Director and be based in Houston.

After more than 37 years of Shell service, Shell Oil Company President and U.S. Country Chair, Bruce Culpepper, has confirmed his plan to step down from this role effective December 31, 2018.

Concurrent with Culpepper stepping down, Gretchen Watkins will assume the role of Shell Oil Company President and U.S. Country Chair, accountable to the CEO. While serving in her expanded role, Watkins will retain her title as EVP Unconventionals.

Watkins became COO of Maersk Oil in January 2014 and was CEO of Denmark-based Maersk Oil starting in October 2016, according to World Oil. Watkins announced in September she would pursue other career opportunities after the completion of Total's acquisition of Maersk Oil.