5 Tall Tasks for John Ternus, Apple’s Next C.E.O.

Apple said this week that Tim Cook, its chief executive since 2011, would step down and become its executive chairman in September. John Ternus, the company’s head of hardware engineering, will succeed Mr. Cook in the corner office. Mr. Ternus, who has worked at Apple for 25 years, will take over a moneymaking behemoth facing a series of pressing questions, including geopolitical threats, an unpredictable man in the White House, artificial intelligence, and the search for new ideas. Here are some of the challenges confronting Mr. Ternus: Navigating Apple’s ties…

Tim Cook Did Wonders for Apple. He Also Did a Lot for Xi Jinping.

Tim Cook is ending his illustrious stint as chief executive of Apple. The soft-spoken operator accomplished the near impossible, filling the shoes of the visionary co-founder Steve Jobs, turning the iPhone from a cultural phenomenon into a financial juggernaut and transforming his company into a $4 trillion goliath — growing its market value by $682 million per day, on average, for 15 years. By the metrics investors care about, Mr. Cook is nothing short of a rock star. But when one considers his role in the sweep of American history,…