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The diversified energy manufacturing and logistics company announced in a US Securities and Exchange Commission filing on Friday that Maxwell will be replaced by Vice President of Investor Relations Kevin Mitchell.
Maxwell has served as CFO since Phillips 66 broke off from ConocoPhillips in 2012.
Mitchell will take over the role of vice president and finance chief on January 1, 2015.
He worked with Conoco since 1991 and served as the company's vice president, investor relations, since joining Phillips 66 in September 2014.
Mitchell has a long history with the organization, previously serving as the general auditor of ConocoPhillips. He also served as a vice president of exploration and production.
Maxwell's retirement ends a long courtship with the company. He joined Phillips Petroleum Company in 1978 as a staff accountant in the comptrollers group. In 1989, he moved to corporate planning and development as a senior planning specialist.
In 1991, Maxwell became a senior financial analyst in the corporate treasury department. He held various other positions until 1998 when he was appointed general auditor for Phillips Petroleum Company until joining Chevron Phillips Chemical in 2000.