She earned the B.M., M.M., and Ph.D. degrees in music therapy from the Florida State University. Prior to her teaching career, Register worked as a private practice music therapist in Tallahassee and Tampa, Florida providing services to early intervention programs, students with special education needs, bereaved children and adolescents and battered women and children. In addition to her contributions to music therapy in the U.S., she also helped developed and launch the first music therapy Masters degree program in Southeast Asia at Mahidol University College of Music in 2013. She continues her work there as a consultant and researcher.