NEW YORK, NY - JUNE 03: Warren Buffett (L) and Bill Gates attend the Forbes' 2015 Philanthropy Summit Awards Dinner on June 3, 2015 in New York City. (Photo by Dimitrios Kambouris/Getty Images)
NEW YORK, NY - JUNE 03: Warren Buffett (L) and Bill Gates attend the Forbes' 2015 Philanthropy Summit Awards Dinner on June 3, 2015 in New York City. (Photo by Dimitrios Kambouris/Getty Images)