Oppenheimer mụrụ na New York City na Eprel 22, 1904, na Julius Oppenheimer, a bara ọgaranya Juu akwa mbubata onye kwagara na United States si Germany na 1888, na Ella Friedman, a na-ese. Julius bịara America na-enweghị ego, ọ dịghị baccalaureate ọmụmụ, na ọ dịghị ihe ọmụma nke asụsụ Bekee. Ọ nwetara ọrụ na a akwa ụlọ ọrụ na n'ime a afọ iri bụ onye na-ahụ maka na ụlọ ọrụ. Ella si Baltimore. The Oppenheimers bụ ndị na-abụghị observant Ashkenazi ndị Juu. Na 1912 ezinụlọ kwagara n'otu ụlọ na 11 nke 155 Riverside Drive, nso West 88th Street, Manhattan, a ebe mara maka okomoko mansions na obodo. Ọrụ ha gụnyere Pablo na Édouard Vuillard, na ọ dịkarịa ala atọ mbụ eserese site Robert Vincent van Gogh.
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