His Who's upside down? 1990, c1952: CIP t.p. (Crockett Johnson) data sheet (b. 10/20/06, d. 7/11/75)
Wikipedia, May 2, 2015 : (Crockett Johnson was the pen name of cartoonist and children's book illustrator David Johnson Leisk (October 20, 1906 in New York City-July 11, 1975). He is perhaps best known for the comic strip Barnaby (1942-1952) and the Harold series of books begun with Harold and the Purple Crayon. From 1965 until his death Johnson created over a hundred paintings relating to mathematics and mathematical physics. Eighty of these are found in the collections of the National Museum of American History.)