John Ternus assumed the role of chief executive officer at Apple on Tuesday, marking the end of Tim Cook’s 15-year tenure at the helm of the tech giant. Ternus, 51, joins the company at a pivotal time as Apple faces increasing pressure to accelerate advancements in artificial intelligence while maintaining its dominant position in the smartphone market.

A seasoned engineer who has been with Apple since 2001, Ternus previously served as senior vice president of hardware engineering, overseeing the development of the company’s product lineup, including the iPhone, Apple’s primary revenue source. His appointment reflects a shift toward emphasizing hardware innovation, an area where Ternus has deep experience, contrasting with some expectations that the software-focused Craig Federighi might have been a more fitting successor amid rising AI competition.

Industry analysts expect Ternus to build on Apple’s established strengths rather than overhaul existing strategies. Dan Ives, senior managing director at Yorkville Ives & Co., noted that Cook left the company in “phenomenal order” and predicted Ternus would concentrate on hardware, while maintaining the supply chain system that Cook meticulously developed. Carolina Milanesi of Creative Strategies emphasized the continued importance of hardware to consumers, arguing that AI adoption depends heavily on the devices themselves.

Ternus faces significant challenges beyond technology. Apple’s complex supply chain remains concentrated in China, a strategy that has come under intense scrutiny from the U.S. government. Cook navigated these tensions by balancing relations with both Beijing and the White House, a role that will now test Ternus’s diplomatic skills. Although Apple has started diversifying manufacturing to countries like India and Vietnam, China continues to serve as a key hub for production and a major consumer market.

The transition also comes amid demands from former President Donald Trump and other U.S. policymakers for Apple to manufacture iPhones domestically, creating potential for ongoing trade conflicts. Ternus will need to quickly familiarize himself with these geopolitical dynamics, an area where he has less experience compared to his extensive hardware background.

Cook will remain with Apple as executive chairman, focusing on global policy advocacy and maintaining relationships with government leaders worldwide. His compensation will decrease to a $2 million base salary, with total earnings potentially reaching $47 million in the coming year, while Ternus’s compensation package includes a $3 million base salary and stock options that could elevate total remuneration to $58 million.

Ternus’s leadership will be tested as Apple prepares for its annual iPhone event on September 9, where the company is expected to unveil its first foldable handset, signaling its entry into a new era of hardware design. How Ternus will steer Apple through the evolving landscape of AI innovation and geopolitical complexity remains to be seen.