Hi @nachomolina.
First, many for participating in the contest, you are the first to do so, I hope not the only one. I know that this time you have to do some research, unlike the previous ones, but I think that knowing about these well known characters will always be a great gain for each of us.
He is an example this gentleman, no doubt. Most people only see the results and not the process. But recently I read that this gentleman came with very few resources to the USA from South Africa, sleeping in an office that he and his brother rented in one of the cheapest areas they could get, bathing in a gym, and you see, one of the richest men in history.