'Little Joe' (Philadelphia Inquirer, 8 February 1942).
Robert "Bob" Leffingwell was the brother of Ed Leffingwell, who created the 'Little Joe' (1933) Sunday page. He had succeeded his brother as the assistant of his cousin Harold Gray on 'Little Orphan Annie'. When Ed died in 1936, he continued 'Little Joe' for Tribune Media Services until the end of its run in 1972. He also created art for 'Little Orphan Annie' shortly after Gray's death in 1968, but the strip was eventually continued by Tex Blaisdell. In the 1930s, Leffingwell has also done comic book art for companies like Centaur ('Evidence Eddy', 'Taint So!') and National Periodicals ('It's A Dern Lie', 'Sagebrush 'n' Cactus', 'Sir Loin of Beef').
Robert B. Leffingwell should not be confused with animator and comic writer Robert G. Leffingwell (30 July 1909 - 18 October 1984).
'Ze Gen'ral', topper to Little Joe (1 April 1945).