Apple's got a new chief of operations, Jeff Williams, its first since CEO Tim Cook held the role. The Wall Street Journal, citing an unnamed senior executive at the company, said "the move isn't necessarily a sign that Mr. Williams is the heir apparent to Mr. Cook...many members of the current executive team have what it takes to be the future CEO." "Jeff is hands down the best operations executive I've ever worked with," Cook said in a statement. Apple declined to comment beyond its press release. Johny Srouji, a top semiconductor executive at the company, also joined Apple's executive team as senior vice president for hardware technologies. The appointments come at a key time for Apple. The iPhone 6, introduced last year, made it the most profitable company in the world, but some worry about Apple's reliance on its smartphones.