Jack Yellen

Jack Selig Yellen (Jacek Jeleń; July 6, 1892 – April 17, 1991) was an American lyricist and screenwriter. He is best remembered for writing the lyrics to the songs "Happy Days Are Here Again", which was used by Franklin Roosevelt as the theme song for his successful 1932 presidential campaign, and "Ain't She Sweet", a Tin Pan Alley standard.