The Kauffman Foundation is often referred to as one of the largest foundations in the United States—or as the world's largest foundation devoted to entrepreneurship. Both are true, thanks to Ewing Kauffman's generosity and foresight. However, these "largest" factoids may give the false impression that we can influence society just by virtue of our size or spending power.
Check out the Kauffman Foundation website here. Ewing Marion also founded Marion Laboratories, a pharmaceutical company. (Thanks, Gloria)