An exceptional mind
Simply because he wanted to see if the (at the time) latest Intel CPU could do proper semaphore stuff and other things, this kid (at the time) kickstarted an entire industry that now has a firm majority of all the servers in the world under its reign.
No, he didn't write all of it and yes, it took a lot of people a lot of time to get to this point, but he was the pebble that started the landslide and he is still the God-Emperor, The One Who Decides. And thank God he does.
I don't think we'll be seeing ads in Linux any time soon.