This is the second in a series of three video in which Fool contributor Daniel Sparks highlights the CEOs in tech he believes did the most notable job in 2013. In the first, Daniel identified Yahoo!'s Marissa Mayer as the third-best CEO in tech. Who gets second place? Apple (NASDAQ:AAPL) CEO Tim Cook, Daniel says.

Why? As the CEO of the world's most valuable publicly traded company, Cook has a tough job. His greatest competitor is the law of large numbers. Apple has set an incredibly high standard across several different product categories, and the company's reach is global. Growing the business from this point, therefore, isn't easy. But in 2013, Cook managed to not only grow the company's revenue, but also to stabilize declining gross profit margins -- all with its existing product lines.

To find out more on why Daniel thinks Cook did a top-notch job in 2013, check out the following video.

Fool contributor Daniel Sparks owns shares of Apple. The Motley Fool recommends Apple and Yahoo! and owns shares of Apple. Try any of our Foolish newsletter services free for 30 days. We Fools don't all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.