John Ternus takes over as Apple’s CEO on Tuesday.

He replaces Tim Cook, who led the company for 15 years.

During Cook’s tenure, Apple’s value grew to $4.6 trillion, driven by the iPhone’s popularity.

The change comes as Apple faces pressure in artificial intelligence.

The company has stumbled in delivering promised AI features.

Earlier this year, it unveiled upgrades to Siri, focusing on privacy and daily use.

Apple is trying to catch up with rivals.

Ternus must step beyond his hardware engineering background.

He needs to keep Apple competitive in AI.

He also faces supply chain questions and must manage relations with President Donald Trump.

Trump praised Cook publicly on Tuesday.

Ternus worked on products like the Apple Watch, AirPods, and Vision Pro under Cook.

He will lead next week’s iPhone launch in Cupertino, California.

Cook is expected to stay on as executive chairman.

He will likely help maintain Apple’s ties with Trump.