From the mid-1970s through the ’90s, she had a career at most of the world’s top opera houses, but in 1991 she began the job for which she’ll be remembered: teaching singing at the Mannes College of Music in Manhattan. Among her students, there and in her private studio, were Deborah Voigt, Sondra Radvanovsky, Nadine Sierra, Kate Lindsey, and Danielle de Niese. – The New York Times