The Katzenjammer Kids is an American comic strip created by Rudolph Dirks in 1897 and later drawn by Harold Knerr for 35 years (1914 to 1949). It debuted December 12, 1897, in the American Humorist, the Sunday supplement of William Randolph Hearst’s New York Journal. Dirks was the first cartoonist to regularly express comic characters’ dialogue using speech balloons. The comic strip was turned into a stage play in 1903. It inspired several animated cartoons and was one of 20 strips included in the Comic Strip Classics series of U.S. commemorative postage stamps.