Thomas Andrew Lehrer (born 9 April 1928) is an American musician, singer-songwriter, satirist, and mathematician, who later taught mathematics and musical theater. He recorded pithy and humorous songs that became popular in the 1950s and 1960s. His songs often parodied popular musical forms, though they usually had original melodies. Lehrer's early performances dealt with non-topical subjects and dark humor in songs such as "Poisoning Pigeons in the Park". In the 1960s, he produced songs about timely social and political issues, particularly for the U.S. version of the television show That Was the Week That Was. The popularity of these songs has far outlasted their topical subjects and references. Lehrer quoted a friend's explanation: "Always predict the worst and you'll be hailed as a prophet." In the early 1970s, Lehrer largely retired from public performance to devote his time to teaching mathematics and musical theater history at the University of California, Santa Cruz.