Bill Gates credits his mother with encouraging him to become philanthropic-- she was first female president of King County United Way.
"Today, Bill Gates is one of the biggest philanthropists in the world. Through the Bill & Melinda Gates Foundation, he donated a total of $1.5 billion in 2014 alone, mostly towards efforts to improving health and education around the world. Gates credits his philanthropic spirit to his late mother Mary, who died of breast cancer in 1994." -- Madeline Stone, Business Insider