A crash course in changing the world.
José Mujica, former president of Uruguay would be my choice because of his humility and generosity. He was known as the poorest president of Uruguay, not because the salary was so low but because he decided to donate the majority of his salary to charities. He even gave up living in a luxurious presidential mansion to keep on living on his little farm. He kept up with his farmer duties including with his presidential ones but he kept on living a life of humility and that is something that i could really admire.