Donald Jeffrey Herbert (born Donald Jeffrey Herbert Kemske; July 10, 1917 – June 12, 2007), better known as Mr. Wizard, was an American television personality. He hosted two television shows about science aimed at children.
He became known as Mr. Wizard after gaining notoriety for hosting Mr. Wizard's World on Nickelodeon from 1983 to 1990, which was a faster paced revival of Watch Mr. Wizard, which began in 1951.