Following school, Seegar performed on stage in London, starting her career with Three Men on a Horse.
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Other plays which he directed there in the immediate post-war period were Romain Rolland's Le Jeu de l'amour et de la mort (1945), Shakespeare's As You Like It (1946) and The Taming of the Shrew (1947), Holm and Abbott's Three Men on a Horse (1946), Gogol's Marriage (1947) and Zuckmayer's Des Teufels General (1948).
In addition to movies, in the 1950s the theater was the site of many live summer theater productions such as Tennessee Williams's The Glass Menagerie and George Abbott and John Cecil Holm's Three Men on a Horse.