If you are familiar with the Caldecott medal,Coretta Scott King Award,Society of Illustratorsmedal and other award winning husband/wife team of Diane and Leo Dillon, you know this is a truly sad loss. I have always admired the depth and range of styles that Leo brought to their picture books.
He was the first African American to win the Caldecott medal among other honors.
Check out samples of his work in this obituary on Tor.
A favorite of mine is shown on the NYTimes site - a scene from Mansa Musa, seen below.