Author and illustrator of nearly forty children's books, including the controversial 1936 work, The Story of Ferdinand. He is also known for his Watchbirds cartoon series.
After graduating from the University of Maryland and subsequently receiving a Master's degree in English Literature from Harvard, he became an editor for a publishing company.
His 1936 Story of Ferdinand, about a Spanish bull who preferred flowers to bullfights, was widely regarded as a work of pacifism and was decried both in Spain and Germany during the pre-World War II period.
He was born in Hamilton, Baltimore, Maryland.
During World War II, he teamed up with Theodore Geisel (better known as Dr. Seuss) to create pamphlets depicting cartoon mosquitoes to warn enlisted men about the dangers of malaria.