Tuhia he tohutoro mō tēnei wāhanga - I heke mai tōna whānau ki Amerika i a ia e tamariki ana, i te āwhina a te Hebrew Immigrant Aid Society. I haere ia ki te kura i Connecticut, i puta i te tau 1910. Engari i te ako i te pūkaha i te Whare Wānanga o Yale, ka whakatau te taiohi o Horwitz me tētahi hoa ki te whakatuwhera i tētahi toa hokohoko i Manhattan. Hei mema o te Tiaki Motu o te United States, i karangahia a Horwitz ki te mahi i raro i a John J. Pershing ki te whai waahi ki te Pancho Villa Expedition
He aha? I tōna hokinga mai, i kitea e ia kua kore te pakihi hokohoko. I mahi a Horwitz i te Pakanga Tuatahi o te Ao i Parani hei kaitiaki, hei hoia hoia i Argonne.