He was the youngest of four children of Samuil Horowitz and Sophia (née Bodik), who were assimilated Jews. His father was a well-to-do electrical engineer and a distributor of electric motors for German manufacturers. His grandfather Joachim was a merchant (and an arts-supporter), belonging to the First Merchant's Guild, which exempted him from having to reside in the Pale of Settlement. In order to make him appear too young for military service so as not to risk damaging his hands, Samuil took a year off his son's age by claiming that he was born in 1904. The 1904 date appeared in many reference works during Horowitz's lifetime.
He was the youngest of four children of Samuil Horowitz and Sophia (née Bodik), who were assimilated Jews His father was a well-to-do electrical engineer and a distributor of electric motors for German manufacturers. His grandfather Joachim was a merchant (and an arts-supporter), belonging to the First Merchant's Guild, which exempted him from having to reside in the Pale of Settlement. In order to make him appear too young for military service so as not to risk damaging his hands, Samuil took a year off his son's age by claiming that he was born in 1904. The 1904 date appeared in many reference works during Horowitz's life.time.