 After being trained at "Helmut Kraus's" Drama School, Erni Mangold performed from 1946 to 1956 at Vienna's Theater in der Josefstadt.From 1955 to 1963, Gustaf Gründgens engaged her for Deutsches Schauspielhaus in Hamburg, afterwards she appeared at the Düsseldorfer Schauspielhaus under Karl Heinz Stroux.From 1972, she worked at Salzburg Mozarteum, later she taught in the "Helmut Kraus's" Drama School and at the Max Reinhardt Seminar, and from 1984 to 1995 she was professor at University of Music and Performing Arts, Vienna.