Udo J. Keppler (April 4, 1872 - July 4, 1956) was an American political cartoonist, Native American advocate, and publisher, known as Joseph Keppler Jr. beginning in 1894. The son of Joseph Keppler (1838 - 1894), the founder of Puck magazine, he was born in St. Louis, Missouri, and graduated from the Columbia Institute in 1888. Between 1890 and 1891, Keppler studied in Germany, and worked for Puck from 1890 until 1914. He contributed cartoons to the magazine beginning that year and became a co-owner of the magazine after his father's death in 1894. He changed his name to Joseph Keppler Jr. after he inherited his father's position at the magazine. He sold Puck in December 1913, and stayed on as art director for another four months. After the sale of Puck, Keppler contributed to Judge and Leslie's Weekly until 1915, and retired in 1920. He moved to La Jolla, California, in 1946 where he died ten years later. He married Louise (Lulu) Eva Bechtel, a match opposed by his mother and sister, on April 4, 1895.