Tim Cook, CEO of Apple Inc.

When Tim Cook took over as Apple’s chief executive in August 2011, the company was already one of the most powerful technology businesses in the world, but it was still, unmistakably, Steve Jobs’ Apple.

The iPhone was transforming the mobile industry and the iPad had created a new category of computing. The Mac remained an important part of the company’s identity.

Jobs, despite his worsening health, had spent years embedding his philosophy of product design, secrecy and relentless execution into the organisation, and Tim Cook inherited that legacy.

He did something more difficult than simply preserving it as he built a different Apple.