Wenzel first began at Disney in 1958, working for the studio for 42 years, creating thousands of illustrations for movies and consumer products. Wenzel worked on over 100 movie posters during his tenure as a designer/illustrator for the Motion Picture Advertising Department, including the Academy Award winning "Mary Poppins"; re-releases of "Pinocchio" and "Song of the South"; "The Parent Trap"; "Herbie Goes Bananas"; "Gus"; "The Monkey's Uncle"; "The Misadventures of Merlin Jones"; "The Horse in the Gray Flannel Suit"; "Moon Pilot"; "Summer Magic"; "Pete's Dragon"; "Dragonslayer"; "The Black Cauldron"; and "Fox and the Hound". Wenzel created concept paintings for "Primeval World" as part of Walt Disney's Ford Motor Company "Magic Skyway" attraction at the 1964–1965 New York World's Fair. Wenzel created concept art of The Haunted Mansion that would later become the cover of the 1964 Disneyland Records album "Chilling, Thrilling Sounds of the Haunted House". Wenzel also designed nearly a dozen Disney Company Christmas cards.