Hank Ketcham created the Dennis the Menace comic strip back in 1951, for which he receive the Reuben Award. He would go on to pen the comic strip till 1994. Al Wiseman worked as a cartoonist and assistant to Ketcham for the Dennis the Menace series. along with Fred Toole as the writer. After Wiseman left Dennis the Menace in the 1960s, cartoonist Owen Fitzgerald stepped in as assistant to Hank Ketcham.