Page "Lukas Foss" Paragraph 3

Foss also studied with Sergei Koussevitzky during the summers from 1939 to 1943 at the Berkshire Music Center ( now known as the Tanglewood Music Center ) and, as a special student, composition with Paul Hindemith at Yale University from 1939 to 1940.

He became an American citizen in 1942.