Alex Hassilev is an American musician and songwriter, best known as a founding member of the folk group The Brothers Four. Born on September 30, 1936, he has contributed significantly to the folk music scene since the 1960s. The group gained fame with their hit songs, including "Greenfields," which showcased their harmonious sound and storytelling. In addition to his work with The Brothers Four, Hassilev has been involved in various musical projects and collaborations throughout his career. He is recognized for his guitar skills and vocal abilities, helping to popularize folk music during a transformative era in American music history.