Born in New York City, she was the daughter of cellist Gregory Aller (né Grisha Altschuler), a Jewish emigre from the Russian Empire. Eleanor Aller became principal cellist in the Warner Bros. Studio Orchestra in 1939, of which her brother, pianist Victor Aller, was orchestra manager and in which their father also played for a time. The same year she met and married Felix Slatkin. Shortly after their marriage, the couple founded the Hollywood String Quartet. Aller also continued working as a Hollywood studio musician. After Slatkin's death in 1963, in addition to her work with orchestras for movies, Aller played in orchestras for recordings done by Frank Sinatra, who had become a family friend over the years.
^"Fred Zlotkin Reminisces: about growing up in the Slatkin household with parents Felix and Eleanor Slatkin and brother Leonard Slatkin". London: The Felix Slatkin Website. September 9, 2003. Retrieved 2008-01-05. "My grandfather Gregory Aller's name, prior to his coming to America at the turn of the century, was Grisha Altschuler. He changed the named to "Aller" because (or so I was told) there were so many Altschulers -- indeed, it is a very common name. The Altschuler side of the family is really rife with musicians. Grisha's uncle, Modest Altschuler, was a cellist (making me 4th generation) and he had quite a career. Among other things, he did the St. Petersburg premiere of Tchaikowsky's "Souvenir de Florence" Sextet. When he came to America he formed the Russian Symphony Orchestra (early 1900s). "