filmed and broadcast live on the television program Omnibus. She later appeared on Omnibus again in 1958 singing selections from Carmen, Faust, and Salome under conductor Leonard Bernstein. Other roles she sang at the Met included Donna Elvira, Marina in Boris Godunov, Venus in Tannhäuser, and the title roles in Carmen, Salome, and Vanessa. Her final performance at the Met was as Marie in Wozzeck in February 1965. Other work and later life Lewis gave her first international performance at the Opéra de Montréal in 1945. She made several appearances at the Teatro Municipal in Rio de Janeiro during the 1940s and 1950s, including the roles of Venus, Musetta, Santuzza, Marguerite, Marina, and Donna Elvira. At the Vienna Volksoper she portrayed the title roles in the Austrian premieres of Cole Porter’s Kiss Me, Kate (1956) and Irving Berlin's Annie Get Your Gun (1957). She subsequently performed both these roles and the title roles in Carmen and Salome at the Zurich Opera in Switzerland. Lewis also appeared as a guest artist with numerous American opera companies, including the Central City Opera, Cincinnati Opera, Dallas Opera, Fort Worth Opera, New Orleans Opera, Opera Company of Boston, Pittsburgh Opera, San Antonio Grand Opera Festival, and the Seattle Opera among others. She sang several roles with the San Francisco Opera from 1950 to 1952, including Cherubino in The Marriage of Figaro, Donna Elvira, Giorgetta in Il tabarro, The Marschallin, Musetta, and Salome. In 1956 she portrayed Salome for the very first opera performances presented by the Houston Grand Opera. In 1960 she created the role of Sara in the world premiere of Philip Bezanson's Christmas opera Golden Child which was commissioned for television by the NBC Opera Theatre. In 1965 she performed Marie in Wozzeck at the Lyric Opera of Chicago with Geraint Evans in the title role. One of her last opera performances was as Rosalinde at the Philadelphia Grand Opera Company under the baton of Carlo Moresco in December 1967. After retiring from the opera stage in the late 1960s, Lewis devoted her time to producing and directing operas at the New Haven Opera Theater from 1963 to 1973. She then joined the voice faculty at the Hartt School of Music in 1973 where she taught voice and directed student opera productions for many years. She has two children, Leo and Michael Asen, with conductor and violist Simon Asen (1911–1984), whom she