Richard Arnold Moores was born in Lincoln, Nebraska, and studied art at the Chicago Art Academy. He worked as an assistant to Chester Gould on the backgrounds and lettering of 'Dick Tracy' between 1932 and 1936. In 1936, he created 'Jim Hardy' (later called 'Windy and Padles') for the United Feature Syndicate. He turned to animation in 1942, and joined the Disney Studios. Besides animation projects, Moores also worked on many comics starring the Disney characters.
Moores worked mainly on the newspaper strips during the 1940s and 1950s. He inked the 'Mickey Mouse' strips by Floyd Gottfredson between 1942 and 1945 and was Manuel Gonzales' inker on 'Mickey Mouse' Sundays, 'Alice in Wonderland' and 'Treasury of Classic Tales' from 1950 to 1955. He inked Paul Murry's 'Silly Symphonies' page starring 'Panchito' and 'Jose Carioca' (1942-45) and was a penciller on the Sunday pages of 'Uncle Remus and his Tales of Brer Rabbit' (1946-50) and 'Scamp' (1956), as well as the daily 'Scamp' strip (1955-56). During the same period, Moores additionally illustrated stories for Dell Publishing's comic books with 'Mickey Mouse' and 'Donald Duck', but also with Warner's 'Bugs Bunny' and 'Porky Pig'. He additionally developed TV commercials with Jack Boyd in 1950-1951.
In 1956, Frank King asked him to assist him on the daily 'Gasoline Alley' strip, which he took over competely after its creator's retirement in 1959. Moores' run on the strip was very successful; he modernized the style and focused on a different set of characters than King. When Sunday's artist Bill Perry retired in 1975, Moores also took over this page, aided by Bob Zschiesche. He drew 'Gasoline Alley' until his death in 1986, and he was succeeded by his assistant Jim Scancarelli.