As of 1931, William Siegel became a naturalized citizen of the United States. By 1936 he was informally using the last name Sanderson, a name change that became official as of 1941. Through the 1930s and 1940s, he published magazine illustrations and covers, appearing in The New Yorker, Esquire, Cue, and Harper’s. In 1938, he was appointed art director of the McCue Ad Agency in New York.
