Lester Trimble was an American music critic and composer of contemporary classical music. Encouraged by Schoenberg, who had seen some of his scores, Trimble entered the Carnegie Institute of Technology (now Carnegie Mellon University). While there he studied with Nikolai Lopatnikoff and Frederick Dorian and wrote music criticism for the Pittsburgh Post-Gazette. He earned a Bachelor of Fine Arts in violin and composition from Carnegie in 1948, followed by a Masters in composition. During this time he also spent summers at the Berkshire Music Center at Tanglewood where he studied with Darius Milhaud and Aaron Copland. In 1950, Trimble went to Paris where he continued studies with Nadia Boulanger and Arthur Honegger. He returned from Paris in 1952 and settled in New York, where he was engaged by Virgil Thomson as a critic for the New York Herald Tribune, a post he held for ten years.