A very rich and successful entrepreneur, and one of the founders of Microsoft.
While people like Steve Jobs under Apple have often led the way in terms of innovation, it was Bill Gates that made it affordable, and brought it to the masses.
His software is incredibly successful, and he's freaking rich. But that's okay, because through the Bill and Melinda Gates foundation, he has donated so much money to the greater good it's not even funny.
Love him or hate him, we should at least respect him.
Personally, I prefer Apple, but I do respect Bill Gates for being so influential, and especially charitable.