By San Francisco Business Times

John Bethancourt, Chevron Corp.â¿¿s executive vice president of technology and services, will retire after 36 years with the company.

San Ramon-based Chevron (NYSE: CVX) promoted James Blackwell to replace Bethancourt, starting March 1. Bethancourt, 59, will stick around at Chevron until June, however, to help Blackwell, who is president of Chevron Asia Pacific Exploration and Production Co., learn his new job. Blackwell, 52, has worked at Chevron since 1980.

John Watson, Chevronâ¿¿s CEO and chairman, will be Blackwellâ¿¿s boss.

Chevron also made Rhonda Zygocki, 53, executive vice president of policy and planning as of March 1. Right now, sheâ¿¿s vice president of policy, government and public affairs. Watson will also be her boss.

Steve Green, 53, will move into Zygockiâ¿¿s job. Heâ¿¿s managing director of Chevronâ¿¿s IndoAsia business unit.

Paul Siegele, who is vice president of strategic planning, will become president of Chevron Energy Technology Co., and Chuck Taylor will move into his planning job. Wes Lohec, who runs Chevronâ¿¿s Latin America business unit, will become vice president of health, environment and safety.

Zygocki will be Lohecâ¿¿s boss, and also Taylorâ¿¿s and Greenâ¿¿s.

Siegele moves into a job vacated by Melody Meyer, 53, who is becoming president of Chevron Asia Pacific Exploration and Production Co. (Blackwellâ¿¿s current job).

Chevron also moved Guy Hollingsworth, 57, into the vice president of production job and James Johnson, 51, into the job of president of Chevron Eurasia, Europe and Middle East Exploration and Production Co. (the job Hollingsworth is leaving).

George Kirkland, executive vice president of upstream and gas, will supervise Hollingsworth, Johnson and Meyer.

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