On November 21, 1958, Gamson married conductor Arnold Gamson who was at that time the principal conductor of the American Opera Society.
While in New York, Trembly freelanced with several orchestras, including the Hudson Valley Philharmonic, the Village Light Opera, American Opera Society, and the American Symphony Orchestra, under the direction of Leopold Stokowski.
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He notably co-founded the American Opera Society (AOS) in 1950 with conductor Arnold Gamson, serving as the AOS's Artistic Director for two decades.
He appeared in several concert performances of operas at Carnegie Hall, most notably singing Mitrane in the American Opera Society's performance of Gioachino Rossini's Semiramide with Joan Sutherland and Marilyn Horne.