J. Stephen Simon, director and senior vice president of Exxon Mobil Corp., has announced his intention to retire effective May 31 after more than 40 years of service.

(PICTURE) Bruce Levell has been appointed to the newly created position of chief scientist geology at Shell International Exploration and Production.

(PICTURE) Wood Group Pressure Control announced that Iain Murray has joined the company as vice president of support services.

Enventure Global Technology appointed Joseph Waiter as vice president, general counsel and secretary. Kevin Knight will take on the role of vice president and chief financial officer.

Scott Humphrey has joined Geotrace as manager, Latin America marketing.

Best Energy Services Inc. named industry veteran Jim Carroll executive vice president and chief financial officer. The company also appointed Charles “Chuck” Daniels as chief operating officer.

Petro Summit Investment UK Limited appointed D. Roy Phillips as chief executive officer.