Though not a household name, Oppenheimer is well-known to Apple-watchers as one of the critical voices on the company's earnings calls each quarter. His time at Apple covers an extraordinary period in the company's history that saw the return of Steve Jobs and a resurgence that took it from the edge of bankruptcy to the most valuable company in the world.
During that time, Apple's annual revenue has grown from $8 billion to $171 billion.
In an interesting bit of timing, Goldman Sachs had just announced Monday that Oppenheimer was joining its board of directors.
The company said Luca Maestri, Apple’s vice president of finance and corporate controller, will be promoted to replace him.