 Towsley joined the Filmation animation studio in 1968 as an associate director.He directed episodes of "Fat Albert and the Cosby Kids" (1972-74), "My Favorite Martians" (1973-75), "The New Adventures of Gilligan" (1974-77), "The U.S. of Archie" (1974-76), "The New Adventures of Batman" (1977), "Sabrina, Super Witch" (1977-78) and "The New Adventures of Flash Gordon" (1979-80), among others.He also directed a sequence in Filmation's 1974 film, "Journey Back to Oz".