Donald Ragnvald Christensen (July 6, 1916 – October 18, 2006) was an American animator, cartoonist, illustrator, writer and inventor. He was sometimes credited as "Don Arr". Christensen was a graduate of the Minneapolis College of Art and Design in Minneapolis. After finishing school he worked for the Walt Disney Studio from 1937 to 1941. He left the studio after the 1941 Disney animators' strike, during which he met his wife-to-be, Ivy-Carol Van Horn, a special effects detail artist. Christensen then worked briefly at Warner Bros. Cartoons, primarily as a storyboard artist for Bob Clampett's animation unit. After leaving Warner Bros. he worked independently for nearly four decades as a storyboard writer and artist, primarily for Western Publishing, Dell and Gold Key comic books, as well a