edwynn Keenan's actor father ''Mary Poppins'' actor He voiced Disney's Mad Hatter He turned down the wizard role in "The Wizard of Oz" He provided the voice for Disney's Mad Hatter Famous comedian 1949 Emmy winner for Most Outstanding Live Personality The Perfect Fool Radio comedian dubbed "The Perfect Fool" Player of the Texaco Fire Chief, on old radio "The Diary of Anne Frank" Oscar nominee Comic who sang "I Love to Laugh" in "Mary Poppins" Uncle Albert in "Mary Poppins" He played Uncle Albert in "Mary Poppins"