Robert Emmett "Bob" McGrath is an American actor, singer, musician, and children's author best known for playing original human character Bob Johnson on the long-running educational television series Sesame Street.
McGrath worked with Mitch Millerand was the featured tenor on Miller's NBC-TV television singalong series Sing Along with Mitch for five seasons from 1959 to 1964. He was a singer on the Walt Kelly album Songs of the Pogo. In the mid-1960s, McGrath became a well-known recording artist in Japan, releasing a series of successful albums of Irish and other folk songs and ballads sung in Japanese. This aspect of his career was the basis of his "secret" when he appeared on the game shows To Tell the Truth in 1966 and I've Got a Secret in 1967.