Two short profiles, one of Jeff Bezos (the Amazon guy) and one of Robert Smith (Forbes calls him the nation’s richest African-American):

http://www.businessinsider.com/jeff-bezos-richest-person-philanthropy-2017-7?elqTrackId=10d82b6114db46d085af715336a66f9d&elq=d3b746c84e8841a59edf9cb79a3b5af2&elqaid=18089&elqat=1&elqCampaignId=8057

https://www.forbes.com/sites/nathanvardi/2018/03/06/how-the-richest-black-american-and-his-billionaire-partner-became-top-philanthropists/#68b4d92348e3