#14 Jack Dorsey, CEO, Square

Widely known as the creator of Twitter and as the founder and CEO of Square, a mobile payments company. In 2008, he was named to the MIT Technology Review TR35 as one of the top 35 innovators in the world under the age of 35.

Jack Dorsey, a self-taught programmer, cofounded Twitter and was its first CEO. That's enough of a career maker for anyone, but not for Dorsey.

He then turned around and created a brand new mobile payments industry with Square, a device that turns an iPhone or iPad into a cash register.

#13 Eben Upton, founder and trustee of the Raspberry Pi Foundation

Eben Christopher Upton is a Technical Director and ASIC architect for Broadcom. He is also a founder and trustee of the Raspberry Pi Foundation, responsible for the overall software and hardware architecture of the Raspberry Pi device.

Eben designed a tiny $25 Linux computer that's changed the face of computers for all sorts of projects for hobbyist to developing nations.

In 2006, Eben Upton and his colleagues at the University of Cambridge’s Computer Laboratory came up with an idea for a cheap and easy-to-program computer for kids.

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