Wilfred Emmons Jackson (January 24, 1906 – August 7, 1988) was an American animator, musical arranger and director best known for his work with Walt Disney Productions. Jackson joined Walt Disney Productions in 1928 as a volunteer washing animation cels. He was soon promoted to an animator and was instrumental in developing the Mickey Mousing technique, which synchronized the music and action for Steamboat Willie (1928). He was then made the director for the Mickey Mouse and Silly Symphonies cartoon series, of which he directed the Academy Award-winning short films: The Tortoise and the Hare (1935), The Country Cousin (1936), and The Old Mill (1937). His feature film directorial debut was Snow White and the Seven Dwarfs (1937). Jackson next worked as a sequence director for Pinocchio (1940) and the Night on Bald Mountain/Ave Maria segment of Fantasia (1940).[1][2] He then co-directed several theatrical Disney animated features up to Lady and the Tramp (1955). In 1953, Jackson suffered a heart attack while directing Sleeping Beauty (1959). A year later, after recovering, Disney asked Jackson to produce and direct animated segments for the Disneyland series. After nearly 35 years with Disney, he retired in 1961.