 Boozer made her professional opera debut in 1974 at the Santa Fe Opera as Winter in Francesco Cavalli's "Egisto" with George Shirley in the title role.In 1977 she made her debut at the San Francisco Opera as Sextus in Mozart's "La Clemenza di Tito" with Sandor Salgo conducting and her debut with Michigan Opera Theatre in the title role of Bizet's "Carmen".In 1978 she made her debut at the Lyric Opera of Chicago as Lola in Pietro Mascagni's "Cavalleria rusticana" under the baton of Riccardo Chailly.