Born in Russia, Cores studied in Berlin and at the Juilliard School under Leopold Auer and Paul Kochanski. Cores was a member of the New York Philharmonic from 1925 to 1931. His Dorian String Quartet performed a series of contemporary music concerts on CBS Radio. He performed on recordings for Columbia Masterworks Records and Vox Records. He also taught comedian Jack Benny to play the violin poorly for comedic effect. In 1989, he joined the violin faculty at the Mannes College of Music.
- "Alexander Cores; Violinist, 93". New York Times. February 10, 1994. p. 10. Retrieved August 20, 2011.
- Amédée Daryl Williams (February 2004). Lillian Fuchs: First Lady of the Viola. iUniverse. p. 126. ISBN 978-0-595-30957-3. Retrieved 20 August 2011.
- Schantz, Tom & Enid (April 2004). "Lucy Cores". Rue Morgue Press. Retrieved August 20, 2011.