Ka kammala wannan magana: A shekara ta 1953, Treigle ya fara aiki a New York City Opera, a matsayin Colline a "La bohème". Shekaru uku bayan haka, bass-baritone ya sami nasararsa ta farko, a matsayin Reverend Olin Blitch, a farkon New York na "Susannah" na Floyd. Ya yi wasan farko na Turai a wannan wasan opera, a
Bikin baje kolin duniya na Brussels, a shekara ta 1958.