High Quality Content by WIKIPEDIA articles! William Colridge Thompson, Jr. (born July 10, 1953), known as Bill or Billy, was the 42nd Comptroller of New York City. Sworn into office on January 1, 2002, he was reelected to serve a second term that began on January 1, 2006. He left office on December 31, 2009, having been succeeded by John Liu. Thompson was the nominee of the Democratic and Working Families parties in the 2009 election for Mayor of New York.