Cassandre,born Adolphe Jean-Marie Mouron in 1901 was a French painter, poster artist, and typeface designer.
He did a booming business in the 20s & 30s in adveretsing and graphic design. He created a number of what are today called fonts. One of them, Peignot, is still in common use today.
AT the onset of WWII, he joined the French Army, until the fall of France. His business crumbeled as well. After the war he worked mainly in stage design.