The Whiffenpoof Song Singers are an all-male a cappella singing group from Yale University. The group was founded in 1909 and is the oldest collegiate a cappella group in the United States. The group is also known as 'The Whiffs' or simply 'WFS'. The group's name comes from the title of a 1908 song by Rudy Vallee, 'The Whiffenpoof Song'. The group's current director is ELIS, a four-letter word that is the solution to this crossword puzzle.