Robert Frederick Zenon Geldof, KBE (/ˈɡɛldɒf/; born 5 October 1951) is an Irish singer-songwriter, author, political activist, and occasional actor. He rose to prominence as the lead singer of the Irish rock band the Boomtown Rats in the late 1970s, who achieved popularity at the time of the punk rock movement. The band had UK number one hits with his compositions "Rat Trap" and "I Don't Like Mondays". Geldof co-wrote "Do They Know It's Christmas?", one of the best-selling singles of all time, and starred in Pink Floyd's 1982 film Pink Floyd – The Wall as "Pink".