Katchen was born in Long Branch, New Jersey, and debuted at age 10, playing Mozart's D minor Concerto. Eugene Ormandy heard of his debut, and invited him to perform with the Philadelphia Orchestra in New York. He studied music with his maternal grandparents, Mr. and Mrs. Svet, immigrants from Europe who had taught at the Moscow and Warsaw conservatories, until he was 14. He attended Haverford College, completing a four-year degree in philosophy in three years, graduating first in his class in 1946.

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