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Chevron Corporation said Wednesday it is making three key appointments to its executive team and realigning its existing technology and services organizations.

Jay Johnson becomes senior vice president, Upstream, and Joe Geagea becomes senior vice president, Technology, Projects and Services.

The new roles will report to George Kirkland, vice chairman and executive vice president, Upstream.

The moves take effect January 1.

Pierre Breber will also become corporate vice president and president of Chevron Gas and Midstream, reporting to John Watson, chairman of the board and chief executive officer.

Kirkland will retire in 2015, Chevron said, and Johnson and Geagea will report to Watson.

“These appointments ensure a smooth transition in our upstream business and simplify the delivery of technology and services to all of our businesses,” Watson said. “Jay, Joe and Pierre are experienced leaders who will enhance a very effective leadership team.”

Chevron reported this week that average U.S. oil-equivalent production of oil and gas from wells fell to 651,000 barrels per day in July and August from an average of 659,000 for the entire second quarter.

Worldwide, the second biggest U.S. oil and gas company produced 2.59 million bpd in the first two months of the third quarter, up from 2.58 million in the second.

Non-U.S. output accounted for the increase.

Johnson, 54, currently is president of Chevron’s Europe, Eurasia and Middle East Exploration and Production Company, based in London. He joined Chevron in 1981 and previously has been managing director of the Australia and Eurasia upstream business units.

Geagea, 54, will lead a new organization composed of energy and information technology, capital projects management, procurement, upstream production services and workforce development organizations.

Breber, 49, currently managing director of the Asia South upstream business unit based in Bangkok, Thailand, will lead a Gas and Midstream business that was reorganized earlier this year to consolidate trading operations and strengthen its support to the upstream and downstream businesses, Chevron said.