Steve Jobs has resigned from the job of chief executive at Apple, the company has just announced in a press release.

Jobs will remain at Apple as chairman, but the company is appointing longtime chief operating officer Tim Cook to the job of CEO.

“I have always said if there ever came a day when I could no longer meet my duties and expectations as Apple’s CEO, I would be the first to let you know,” Jobs said in letter to the board. “Unfortunately, that day has come.”

Jobs has long had health problems and had a liver transplant in 2009. He came back from a leave to run the company and launch products such as the iPad, the iPhone 4 and iPad 2. But he had to begin a new medical leave in January.

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Here is the full text of the press release that Apple just released:

Apple’s Board of Directors today announced that Steve Jobs has resigned as Chief Executive Officer, and the Board has named Tim Cook, previously Apple’s Chief Operating Officer, as the company’s new CEO. Jobs has been elected Chairman of the Board and Cook will join the Board, effective immediately.

“Steve’s extraordinary vision and leadership saved Apple and guided it to its position as the world’s most innovative and valuable technology company”

“Steve’s extraordinary vision and leadership saved Apple and guided it to its position as the world’s most innovative and valuable technology company,” said Art Levinson, Chairman of Genentech, on behalf of Apple’s Board. “Steve has made countless contributions to Apple’s success, and he has attracted and inspired Apple’s immensely creative employees and world class executive team. In his new role as Chairman of the Board, Steve will continue to serve Apple with his unique insights, creativity and inspiration.”

“The Board has complete confidence that Tim is the right person to be our next CEO,” added Levinson. “Tim’s 13 years of service to Apple have been marked by outstanding performance, and he has demonstrated remarkable talent and sound judgment in everything he does.”

Jobs submitted his resignation to the Board today and strongly recommended that the Board implement its succession plan and name Tim Cook as CEO.

As COO, Cook was previously responsible for all of the company’s worldwide sales and operations, including end-to-end management of Apple’s supply chain, sales activities, and service and support in all markets and countries. He also headed Apple’s Macintosh division and played a key role in the continued development of strategic reseller and supplier relationships, ensuring flexibility in response to an increasingly demanding marketplace.

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