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She has been commissioned to write works for the American Guild of Organists, George Shirley, the late Duke Ellington, and her sister, the late Joy Simpson, arranged music for Kathleen Battle, Jessye Norman, and the Porgy and Bess Chorus of the New York Metropolitan Opera, and has performed with musical organizations such as Philadelphia's National Opera Ebony (later renamed Opera North).
She has been a featured recitalist at Alice Tully Hall at Lincoln Center in New York City, at the Spoleto Festival USA, at the American Bach Society Biennial, at the Dublin (Ireland) International Organ Festival, and at conventions of the American Guild of Organists, the Organ Historical Society, and the Music Teachers National Association.