Tony Fadell’s company isn’t in the Fortune 500 - but he’s had a had a big impact on several of the 500’s tech giants. Fadell was the brains behind the iPod, and key to developing the iPhone. He went on to create Nest Labs – the company that brought us energy-saving thermostats, and was acquired by Google in 2014. Today, he’s head of Future Shape. The firm invests in environmentally- friendly projects and businesses.