Both Don and Dick played parts in their family's acrobatic group, The Flying Addrisis. In the 1950s, they got in touch with Lenny Bruce about starting a singing career, and moved to California. They auditioned for parts on the Mickey Mouse Club but were rejected; however, they signed to Del-Fi Records soon after, and recorded several singles. Aside from the modest chart hit "Cherrystone" (1959), these were not successes, and further releases from Imperial Records and Warner Bros. Records fared no better, so the pair began working more as songwriters.
Their biggest hit as a songwriting duo was with "Never My Love", a smash hit for The Association. In the 1970s they also charted several more hit singles of their own. They composed the theme music for the TV show Nanny and the Professor as well. They worked together until Don died from cancer in 1984.