After one year at Yale he moved home to Manhattan and worked as an illustrator for a silent film company (Chadwick Films) before joining the staff of the fledgling magazine "The New Yorker". The iconic cartoons and covers he created there, from 1925 through 1968, helped establish the magazine's reputation for sophisticated humor and fine illustration. His work often depicted a cross-section of New York City society, though he was also inspired by situations he encountered during his travels. Arno drew his cartoons in batches, usually over a two-day period each week. Arno often worked with gag writers, one of whom coined the popular expression in a famous March 1, 1941 cartoon.