Oppenheimer ni a bi ni New York City on April 22, 1904, to Julius Oppenheimer, a ọlọrọ Juu aṣọ importor ti o ti ṣí lọ si United States lati Germany ni 1888, ati Ella Friedman, a painter. Julius wá si America pẹlu ko si owo, ko si baccalaureate eko, ati ko si imo ti awọn English ede. O si ni a job ni a aṣọ ile-iṣẹ ati laarin a ọdun mẹwa wà ohun executive pẹlu awọn ile-iṣẹ. Ella wà lati Baltimore. The Oppenheimer wà ti kii-observant Ashkenazi Juu. Ni 1912 awọn ebi gbe si ohun Apartment ni 11th ti 155 Riverside Drive, nitosi West 88th Street, Manhattan, a agbegbe mọ fun igbadun mansions ati ilu. won iṣẹ pẹlu Pablo ati Édouard Vuillard, ati ni o kere mẹta atilẹba awọn aworan nipasẹ Robert Vincent van Gogh.
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