John Ternus took charge as Apple’s new chief executive on Tuesday, succeeding Tim Cook after his 15-year tenure. The 51-year-old engineer faces the challenge of strengthening Apple’s position in artificial intelligence while maintaining its vast operations in China amid political pressure from Washington. Ternus, a longtime hardware leader, will soon oversee Apple’s annual iPhone event on September 9. Analysts expect him to prioritize hardware innovation while preserving the supply chain strategies established under Cook.