There are multiple artists named Paul Williams;

1) Paul Hamilton Williams Jr. (born September 19, 1940) is an American composer, singer, songwriter and actor. He is known for writing popular songs performed by a number of acts in the 1970s, including Three Dog Night’s “An Old Fashioned Love Song” and “Out in the Country,” Helen Reddy’s “You and Me Against the World,” David Bowie’s “Fill Your Heart” and the Carpenters’ “We’ve Only Just Begun” and “Rainy Days and Mondays.”