Born in Vienna, Losch studied ballet from childhood at the
Vienna Opera, making her debut in 1913 in Louis Frappart's 1885
Wiener Walzer. She became a member of the
corps de ballet on March 1, 1918 and a
coryphee three years later. Her first solo role was the Chinese Lady Doll in Josef Hassreiter's
Die Puppenfee. Ballet master Heinrich Kroeller and the Opera's co-director, composer
Richard Strauss, promoted her to soloist on January 1, 1924. She danced prominently in new ballets by Kroeller, Georgi Kyaksht, and
Nicola Guerra. Outside the Opera, Losch took modern dance class with Grete Wiesenthal and Mary Wigman, and performed dramatic and movement roles in Viennese theaters, at the
Salzburg Festival and in
Max Reinhardt's 1924 Berlin production of ''
A Midsummer Night's Dream'', also choreographing the
William Shakespeare play. Losch resigned from the Vienna Opera on August 31, 1927, in order to work more with Reinhardt at the Salzburg Festival and in New York City. She also choreographed Reinhardt's
Everyman and ''Danton's Death''. Losch made her London debut in 1928 in Cochran's production of
Noël Coward's musical revue
This Year of Grace, and over the course of the next few years, worked in London and New York as both a dancer and choreographer. In New York she danced in
The Band Wagon with
Fred and
Adele Astaire in 1931. Reinhardt encouraged her to extend herself and believed she could also act; casting her in a 1932 London production of
The Miracle, Losch's part was rewritten to provide her with the only spoken dialogue in the production (
The Lord's Prayer) which she recited to dramatic effect. ==First marriage==