SAN FRANCISCO, United States (AFP) — Apple on Monday announced that Tim Cook will step down as the tech giant’s chief executive officer in September, handing the top job to company veteran John Ternus.

The announcement answers long-simmering questions about a successor for 65-year-old Cook, who said he will become executive chairman of the board when he cedes Apple’s CEO position.

“It has been the greatest privilege of my life to be the CEO of Apple and to have been trusted to lead such an extraordinary company,” Cook said in a statement.

Cook joined Apple in 1998, rising through the ranks and helping drive its success as chief operating officer, coordinating the iPhone maker’s complex supply chain.

He became chief executive in 2011 after its iconic co-founder and leader Steve Jobs left due to health issues.

Cook is credited with expanding Apple’s product line and ramping up the company’s value to some $4 trillion based on the value of its shares.

“Tim’s unprecedented and outstanding leadership has transformed Apple into the world’s best company,” outgoing chairman of the board Arthur Levinson said in the statement.

“His integrity and values are infused into everything Apple does.”

Levinson currently holds the board chairmanship in a non-executive role. He will become the board’s lead independent director.

Ternus joined Apple’s product design team in 2001 and became a senior vice president of hardware engineering over the course of the following two decades.

He is credited by Apple with playing roles in an array of products, including iPhones, iPads, Apple Watch, and Mac computers.

“I am profoundly grateful for this opportunity to carry Apple’s mission forward,” Ternus said in the same statement.

“Having spent almost my entire career at Apple, I have been lucky to have worked under Steve Jobs and to have had Tim Cook as my mentor.”

Apple marks its 50th anniversary this year as artificial intelligence challenges the Silicon Valley legend to prove it can deliver yet another culture-changing innovation.

Jobs, a driven marketing genius, and Steve Wozniak, who invented the Apple computer, revolutionized how people use technology in the internet age.

The two men — both college dropouts — changed the way people use computers, listen to music and communicate on the go, giving rise to lifestyles revolving around smartphone apps.

Apple’s hit products — the Mac, the iPhone, the Apple Watch and the iPad — command a cult-like following, long after the company’s humble beginnings on April 1, 1976 in Jobs’s Cupertino, California garage.