Leon Lishner

Leon Lishner (4 July 1913 - 21 November 1995) was an American operatic bass-baritone. He was particularly associated with the works of Gian Carlo Menotti, having created parts in the world premieres of four operas by that composer. He performed in many productions with the New York City Opera and the NBC Opera Theatre during the 1950s and early 1960s.
Leon Lishner entry at WikipediaLeon Lishner obituary in the New York Times