ɹˌiːˈaɪzən wʌz bˈɔːɹn ˌɪntʊ ɐ dʒˈuːɪʃ fˈæmɪli ʌv mˈaɪn wˈɜːkɚz ɪn wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd nˈaɪnti fˈaɪv æt zeɪtsˈiːvoʊ vˈɪlɪdʒ ɪn ˈɛkɐɾɚɹˌɪnəslˌæv pɹˈɑːvɪns nˈaʊ hˈoːɹlɪvkə, dɑːnˈɛtsk əblˈæst, juːkɹˈeɪn.
Reizen was born into a Jewish family of mine workers in 1895 at Zaitsevo village in Ekaterinoslav province (now Horlivka, Donetsk Oblast, Ukraine).