Microsoft co-founder Paul Allen has bequeathed the majority of his estimated $13.5bn (£8.8bn) to philanthropy after his death according to the BBC.
Allen set up a charitable foundation 20 years ago to which he has personally donated $600m.
He follows Bill Gates in pledging billion of dollars to charities and projects that help others.
Paul Allen founded Microsoft with Gates in 1975. He left the company in 1983 when he was diagnosed with Hodgkin's disease, a blood cancer.
"I want to announce that my philanthropic efforts will continue after my lifetime," said Mr Allen, the 37th richest man in the world according to Forbes magazine. "I've planned for many years now that the majority of my estate will be left to philanthropy to continue the work of the foundation and fund non-profit scientific research."
Since leaving Microsoft Allen has beaten his cancer and become a successful venture capitalist.
Last month gates and fellow billionaire Warren Buffett started a campaign to urge the richest people in the US to pledge half of their fortunes to charity.
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