April 9], 1889 – February 22, 1985) was a Russian and American concert violinist, composer, conductor and director of the Curtis Institute of Music.

He graduated from the Conservatory in 1907 after winning a gold medal and the Rubinstein Prize, and by age 21 was considered one of the world's greatest violinists.

Mr. Warburg loaned all four to Sascha Jacobsen, Bernard Ocko, and Louis Kaufman, whose teacher was Franz Kneisel, as well as Marie Roemaet-Rosanov, a pupil of the great Pablo Casals, to play at Manhattan's Aeolian Hall.

His pupils included such distinguished musicians as Lynn Blakeslee, Aaron Rosand,[11] Oscar Shumsky, Norman Carol, Toshiya Eto, Joseph Silverstein, Jascha Brodsky, John Dalley, Michael Tree, Felix Slatkin, Shmuel Ashkenasi, Harold Wippler, Leonid Bolotine, Takaoki Sugitani, Helen Kwalwasser, and Hidetaro Suzuki.

[12] His own compositions include a violin concerto, a piano concerto (1959), the American Rhapsody, a tone poem called Daphnis and Chloe, a Fantasy on themes from The Golden Cockerel by Nikolai Rimsky-Korsakov, a Fantasy on Bizet's Carmen (1936), and a piece called Sarasateana, for viola and piano.

Although he continued to consider himself ethnically Jewish, he found himself attracted, along with his wife Alma, to Anglican Christianity, and they regularly attended the Episcopal Church in New Hartford.

[18] Efrem Jr. portrayed Dandy Jim Buckley in Maverick opposite James Garner, and the lead characters in the television series 77 Sunset Strip and The FBI.