Franklyn M Branley

David Johnson Leisk (October 20, 1906 – July 11, 1975), professionally known by his pen name Crockett Johnson, was an American cartoonist and children's book illustrator. He is best known for the comic strip Barnaby (1942–1952) and the Harold series of books, beginning with Harold and the Purple Crayon. From 1965 until his death, Johnson created more than a hundred paintings relating to mathematics and mathematical physics. Eighty of these are found in the collections of the National Museum of A…