Bill Gates
Even though many will not agree, Id say Bill Gates. It was he who made the personal computer a realizable aspect of households whilst the apple desktops were expensive and aimed at businesses at the time, but more advanced. Also, he is the one donating the billions of dollars that is going towards helping the African continent gain education and medicine; he's having a profound effect on the lives of millions.
To be honest, all Steve Jobs has done is spearhead the development of technology that is unavaliable to those in poverty, you don't see him helping out much, except for the product red stuff, but the contribution is tiny compared to Bill Gates's.