Apple's new CEO, John Ternus, takes over the iconic tech giant on Tuesday, ending Tim Cook's 15-year leadership, during which the company's value soared to $4.6 trillion, driven by the iPhone's huge popularity.

The transition to a new CEO comes at a pivotal time for Apple.

Artificial intelligence has unleashed the greatest upheaval within the industry since Steve Jobs unveiled the first iPhone in 2007.

Apple has gotten off to a rough start in AI after stumbling in its efforts to deliver new features built on the technology, as promised nearly two years ago.

Earlier this year, it unveiled new advances in artificial intelligence, including upgrades to its Siri assistant, underscoring a commitment to privacy and everyday usability as the iPhone maker strives to close the gap with its competitors.

Ternus confronts challenges that will compel him to venture beyond his established expertise in hardware engineering.

In addition to devising strategies to sustain Apple's competitiveness in the artificial intelligence arena, he must contend with supply chain complexities and manage relationships with figures such as President Donald Trump, who publicly commended his predecessor on Tuesday.

Assuming the role of Apple CEO will also require considerable interpersonal skills, particularly the ability to build strong relationships with key figures.

Cook managed to develop a rapport with Trump while guiding the company through various business challenges, including Trump's trade and tariff war targeting Asian countries, where Apple has extensive manufacturing supply chains.

Although he is stepping down as CEO, Cook is widely expected to help the company maintain a good relationship with Trump after he moves into his new role as executive chairman.

Ternus played a pivotal role in developing several of Apple’s flagship products under Cook’s leadership, notably the Apple Watch, AirPods, and Apple Vision Pro.

He is set to spearhead the upcoming unveiling of the latest iPhone at Apple’s headquarters in Cupertino, California, next week.