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As a performer Breault is known for his strong acting skills and diverse repertoire, which ranges from Handel to current. He was honored by New York City Opera in 2007 with a 'Kolozsvar Award' for his performance in Handel's ‘’Semele’’. He has recorded several world premieres, including James DeMars’ opera ‘’Guadalupe’’ and his oratorio An American Requiem with the Mormon Tabernacle Choir, and Laurent Petitgirard's Joseph Merrick dit Elephant Man. Active as a singing teacher since 1992, Breault has trained and worked with several successful singers including Celena Shafer, Paula Delligatti, Jennifer Larson, Gary Moss, Chad Hilligus, and Hugo Vera. He works regularly as a voice teacher and director with the La Musica Lirica training program in Nova Feltria, Italy. He is also active as a recitalist and had presented two debut recitals with the San Francisco Opera Schwabacher Debut Recital series. Robert's dual role as singer and educator has been noted by the likes of Brian Kellow who, upon hearing Breault in Handel's Semele at New York City Opera, wrote a summary of his career in 2007 for Opera News.