About Ruth Kobart
Ruth Kobart was an American performer, whose six-decade career encompassed opera, Broadway musical theatre, regional theatre, films, and television. Kobart's association with San Francisco's American Conservatory Theater began with its first season in 1967 and lasted through 1994. With the NBCOT she notably created the role of Agata in the world premiere of Gian Carlo Menotti's Maria Golovin at the Expo '58 in Brussels on August 20, 1958; later the same year she portrayed the role on Broadway. For the NBC, she also created the role of Arina in the premiere of Bohuslav Martinů's The Marriage.
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.