After the war Herbert worked at a radio station in Chicago where he acted in children's programs such as the documentary health series "It's Your Life" (1949). It was during this time that Herbert formulated the idea of Mr. Wizard and a general science experiments show that used the new medium of television. Herbert's idea was accepted by Chicago NBC station WNBQ and the series "Watch Mr. Wizard" premiered on March 3, 1951. The weekly half-hour live television show, co-produced by Jules Power, featured Herbert as Mr. Wizard and either a boy or a girl with whom Herbert performed interesting science experiments. The experiments, many of which seemed impossible at first glance, were usually simple enough to be re-created by viewers.