Oper Köln
Since 1971, in addition to performing regularly with the Cologne Opera, Kertész-Gabry taught at the Folkwang-Musikschule. Before 1977 she received a teaching appointment at the Cologne University of Music. In 1988, she performed one of her last notable performances at the Schwetzingen Festival. There she sang the role of Berta in Rossini's "The Barber of Seville".