Apple has announced that its CFO Peter Oppenheimer is leaving Apple for retirement in September this year. Luca Maestri, vice president of finance, will take over as CFO. The transition will begin in June to smooth the changeover from Oppenheimer to Maestri.

Oppenheimer has been at Apple since before Jobs returned in 1997, as a senior director. He became Senior Vice President and CFO in 2004. Yesterday, it was announced that Oppenheimer would join Goldman Sachs as a board member. Oppenheimer was the lead of the Apple Campus 2 project; whether Maestri will take over this responsibility is currently unclear.

Tim Cook commented on the announcement, congratulating Peter for his management as Apple grew. Cook says that Oppenheimer has been “instrumental” to Apple’s success.

Tim Cook says he is confident in Maestri, with over 20 years of experience in finance matters. In the press release, Cook says they knew Maestri would be Oppenheimer’s successor as soon as he joined Apple.

It was speculated that Maestri may be taking a bigger role in Apple management as he took a more forward role in Apple’s conference calls, even answering investor questions in the January call. Before joining Apple, Maestri worked at Nokia Siemens and Xerox as CFO. He joined Apple in March 2013.

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Apple’s new CFO left Nokia in February 2011; interesting timing (same month they announced they were choosing Windows Phone).

— Steve T-S (@stroughtonsmith) March 4, 2014