Born in Pittsburgh, Pennsylvania in 1960, Flaherty began studying piano at the age of seven and composed his first score for a musical at 14. He went on to graduate from the University of Cincinnati's College-Conservatory of Music in 1982. He also did graduate work in musical theater at New York University and remained based in New York City.
His first collaboration with singer, songwriter, and lyricist Lynn Ahrens was in 1985 for Theatreworks USA, a group specializing in youth-oriented theater. The off-Broadway musical Lucky Stiff followed in 1989 with music by Flaherty and book and lyrics by Ahrens. It also ran briefly on London's West End in 1997. Flaherty and Ahrens contributed separately and together to Schoolhouse Rock! shorts, and the team's first Broadway musical was the one-act Once on This Island. Opening in 1990, it was accompanied by a cast recording on Masterworks Broadway and received eight Tony nominations, including the categories of best musical, book, and score.
Their most high-profile success to that point came in 1997 with the release of the hit Twentieth Century Fox animated film Anastasia. Based on the legend of the daughter of Russia's Tsar Nicholas II, the film earned Flaherty two Academy Award nominations, for Best Original Musical or Comedy Score (with Ahrens and David Newman) and Best Original Song "Journey to the Past" (with Ahrens). He and Ahrens also collaborated on its straight-to-video sequel, 1999's Bartok the Magnificent.
In the meantime, the Ahrens-Flaherty musical Ragtime premiered in Toronto in 1996, then ran in Los Angeles in 1997 before opening on Broadway in January 1998. An epic based on the 1975 novel by E.L. Doctorow about class issues in early 20th century New York, its score was steeped in the period's ragtime music, as well as incorporating other thematic material, such as Eastern European folk music. The production was nominated for 12 Tony Awards, winning four including Flaherty and Ahrens' score and Terrence McNally's book. The songwriting team's subsequent musicals included 2000's Seussical, 2002's A Man of No Importance, 2005's Dessa Rose and musical revue Chita Rivera: The Dancer's Life, and 2007's The Glorious Ones. Among other work -- not all with Ahrens, including the American River Suite with lyricist Bill Schermerhorn -- Flaherty also teamed with Ahrens for Little Dancer, a Degas-inspired musical that played at Kennedy Center in 2014. Their Rocky: The Musical opened on Broadway that same year.
In April 2017, 20 years after the film, a stage version of Anastasia with a book by Terrence McNally opened on Broadway. The cast recording, Anastasia: The New Broadway Musical, arrived on the Broadway label two months later and debuted at the top of the Billboard Cast Albums chart. In December of that year, a revival of Once on This Island also opened on Broadway. Its February 2018 cast recording entered the same chart at number two. ~ Marcy Donelson, Rovi