Susan Seaforth Hayes (born Susan Seabold on July 11, 1943 in Oakland, California) is an American dramatic actress. She is best known for her portrayal of Julie Olson Williams on the NBC drama Days of Our Lives, and her intermittent portrayal of Joanna Manning on the CBS daytime drama The Young and the Restless. She began playing the role of Julie Olsen Williams on Days of Our Lives in 1968, and is the only actor to appear on the show for all six decades (1960s, 1970s, 1980s, 1990s, 2000s, and 2010s) in which it has been on the air. Mrs. Seaforth Hayes still regularly appears on Days as Julie Olsen Williams.