Knerr took over The Katzenjammer Kids Sunday strip in November 1914 when Dirks left the Hearst-owned New York Morning Journal after a legal dispute. During World War I, some newspapers retitled the strip as The Shenanigan Kids, and the nationality of the characters was changed to Dutch instead of German because of World War I anti-German sentiments. It changed back to its original name and contents in 1920. He continued to write and draw the strip until his death in 1949, when it was taken over by Charles H. Winner.
Knerr's continuation of The Katzenjammer Kids has been praised as "a particularly brilliant job... true to the spirit of the original, and yet stylistically his own."
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