His most prominent achievement was the redesign of Felix the Cat, which gave the character his instantly recognizable round shape. After Felix, Nolan directed a new series of Krazy Kat cartoons in 1925; four years later he joined Walter Lantz's studio and supervised the post-Disney Oswald the Lucky Rabbit series, training up-and-coming artists like Tex Avery.
Nolan was renowned as one of the most fastest animators in the business; his work was notable for its fluidity, lightness, and looseness of action.
Cartooning Self-Taught was published in Britain in 1936 in at least two editions, one of which had a color cover. The edition these scans were made from entirely lacks color and has been scanned in black and white.