Formed the 1960s pop group, The Cowsills, with his brothers, Bob Cowsill, Barry Cowsill and John Cowsill. Their siblings, Paul Cowsill and Susan Cowsill, and mother, Barbara Cowsill, later joined the band.
Formed the 1960s pop group, The Cowsills, with his brothers, Bob Cowsill, Barry Cowsill and John Cowsill. Their siblings, Paul Cowsill and Susan Cowsill, and mother, Barbara Cowsill, later joined the band.