Andrew Carnegie (November 25, 1835 - August 11, 1919)
According to Wikipedia, "Carnegie is known for having built one of the most powerful and influential corporations in United States history, and, later in his life, giving away most of his riches to fund the establishment of many libraries, schools, and universities in America, Scotland and other countries throughout the world....
"By the time he died, Carnegie had given away $350,695,653 (approximately $4.3 billion, adjusted to 2005 figures). At his death, the last $30,000,000 was likewise given away to foundations, charities, and to pensioners."
Carnegie was a "self-made" man, immigrating to the United States from Scotland at 13, he began his career as a telegraph messenger for $2.50 a week. From humble beginnings, he went on to become one of the richest men in the world. He distanced himself from religion and identified himself as a positivist.
["Positivism is a philosophy that states that the only authentic knowledge is scientific knowledge, and that such knowledge can only come from positive affirmation of theories through strict scientific method." source]