John Ternus steps into the role of CEO at Apple on Tuesday, marking the end of Tim Cook’s 15-year leadership that elevated the company’s market value to $4.6 trillion. This transition occurs at a significant junction for Apple, as the tech industry faces major changes due to advancements in artificial intelligence.

Apple encountered challenges in AI development, failing to deliver promised features. This setback highlights the need for Ternus to accelerate AI initiatives. Earlier this year, Apple introduced enhancements to its AI, focusing on privacy and practical usage, especially within its Siri assistant, as it seeks to catch up with competitors.

Ternus will need to tackle various challenges that extend beyond his expertise in hardware engineering. He must ensure Apple remains competitive in AI and address supply chain issues. In addition, developing relationships with key figures, such as President Donald Trump, is essential. Trump publicly praised Tim Cook, Ternus’s predecessor, for his adept handling of trade challenges and tariff policies affecting Apple’s extensive manufacturing networks in Asia.

Tim Cook is expected to assist in maintaining positive connections with Trump, even as he transitions to his new role as executive chairman of Apple. Ternus has contributed to some of Apple’s renowned products, including the Apple Watch, AirPods, and Apple Vision Pro. He will be at the forefront of launching the latest iPhone at Apple’s headquarters in Cupertino, California, next week.