Margaret Bloy Graham was born on November 2, 1920 in Toronto, Canada. After receiving a B.A. in art history from the University of Toronto in 1942, she moved to New York City to start her career. She worked at Conde Nast and did freelance projects as a designer and illustrator. In 1948, she married George Zion and they began collaborating on children's book projects. Their first title, All Falling Down, was published in 1951. They produced 13 books as a team before they divorced in 1966, including the Harry the Dirty Dog adventures. Their title, All Falling Down, won a Caldecott Honor in 1952.
Graham's illustrations for Charlotte Zolotow's The Storm Book received a Caldecott Honor in 1953. She wrote and illustrated Be Nice to Spiders and three titles starring Benjy the dog. She also illustrated What If? and It's Spring, both written by Else Minarik. She died on January 22, 2015 at the age of 94.
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