J. Robert Oppenheimer and Julius Oppenheimer

J. Robert Oppenheimer and Julius Oppenheimer had a close, evolving father-son relationship that became especially visible after the death of Ella Oppenheimer. Julius entered his son’s California life not simply as a visitor but as a familiar presence among his friends and colleagues; Robert, in turn, made space for his father in his routines and intellectual company. Their companionship offered a private counterpoint to the ambitious public career that Robert was building.

A Father’s Visit to California

In the spring of 1930, Julius and Ella Oppenheimer visited their son in Pasadena. The family’s circumstances had changed since the prosperous years before the Depression: Julius had retired in 1928, sold his interest in Rothfeld, Stern and Co., disposed of the Riverside Drive apartment and the Bay Shore summer home, and moved with Ella to a smaller apartment on Park Avenue. The stock-market crash had plunged the country into economic hardship, but the family fortune remained intact.

Robert introduced his parents to Richard Tolman and Ruth Tolman, his close friends. The visitors shared dinner and several teas with the Tolmans, and Ruth took them to Los Angeles to hear a Tchaikovsky concert. These encounters show Robert bringing his family into the social world he had made in California, rather than keeping his parental and professional lives apart.

Julius also responded practically to his son’s circumstances. Seeing that Robert’s reconstructed Chrysler groaned, he decided to buy him a new car, despite Robert’s strong protests. Robert named it Gamaliel, a Hebrew name associated with prominent ancient rabbis. The gesture joined paternal care with a change in Robert’s public ease about his background: as a young man he had tried to conceal his Jewish ancestry, whereas the name he chose for the car suggested a newly developed confidence in acknowledging it.

Grief and Growing Companionship

In the summer of 1931, Ella became ill with leukemia. When Julius cabled Robert on October 6 that his mother was critically ill and not expected to live, Robert rushed home and kept vigil at her bedside. He wrote that she was tired and sad but without desperation, and described her as unbelievably sweet. As she became comatose and death approached, he told a correspondent that the family was grateful she would not have to suffer more. Her last words to him were, “Yes—California.”

Ella died on October 17, 1931, aged sixty-two. Robert was twenty-seven. Her death left Julius grief-stricken, but it also preceded a period of increased closeness between father and son. Julius continued living in New York City and soon began visiting Robert in California regularly. Their bond deepened through time spent together, not through a single formal declaration: during the winter of 1932, they shared a cottage in Pasadena while Robert was teaching there.

Robert had lunch with his father every day. Once a week he took Julius to an elite dinner club at the California Institute of Technology, where regular guests heard a speaker and then engaged in vigorous discussion. Robert called these gatherings Stammtisch, using the German term for a table reserved for regular guests. Julius was pleased to be included. He wrote that the dinners were good fun, that he was meeting many of Robert’s friends, and that he believed he had not interfered with his son’s activities. His account suggests a relationship in which Robert’s busy working life and his father’s company could coexist.

A Place in Robert’s Intellectual World

Robert did more than invite Julius into social occasions; he introduced him to people whose company and ideas mattered to him. Julius met Robert’s friends and colleagues, and noted that his son had had a couple of short talks with Albert Einstein. The father’s pleasure in this world did not depend on directing it. He valued being present while recognizing that Robert remained busy and had his own work.

Robert also introduced Julius to Arthur W. Ryder, a Berkeley professor of Sanskrit whom Robert considered an exceptional intellectual. Julius described Ryder as an astounding person, austere yet gentle. Robert later credited Ryder with renewing his feeling for the place of ethics, and admired his tragic understanding of human action and its consequences. The introduction therefore brought Julius into contact not only with his son’s acquaintances but with a scholar whose ethical outlook Robert regarded as important.

Julius’s own interests also found room in these relationships. He played bridge twice a week with Ruth Uehling, who recalled his ability to make a woman feel important and his evident pride in his son. Julius spoke passionately about art. When Ruth visited him in New York in 1936, he had her sit before his Van Gogh painting of a blazing sun so she could observe how the light changed it. These memories portray a father with interests and friendships of his own, while making his delight in Robert’s life unmistakable.

Death, Inheritance, and the Relationship’s Legacy

On September 20, 1937, Julius died of a heart attack at sixty-seven. Robert knew his father was no longer robust, but the sudden death shocked him. In the nearly six years since Ella’s death, Julius had maintained a tender relationship with both sons, visiting them frequently; Robert’s friends often became Julius’s friends as well. His death ended a companionship that had become woven into Robert’s everyday California life.

Julius’s estate, divided equally between Robert and Frank Oppenheimer, amounted to $392,602 despite having diminished during the Depression. The inheritance provided each brother with an average annual income of $10,000 in addition to his earnings. Robert’s response was immediate: he wrote a will leaving his entire estate to the University of California, earmarked for graduate fellowships. The evidence does not reduce that decision to a single motive, but its timing makes it a striking coda to the family’s inheritance. Julius had provided for his sons; Robert, on receiving his share, directed his own estate toward the university and its students.

The relationship’s significance lies in its gradual movement from parental support to shared adult company. Julius’s visits, daily lunches, club evenings, and friendships with Robert’s circle made him a participant in his son’s life without obscuring Robert’s independence. After Ella’s death, that companionship became more regular; Julius’s sudden death then fixed its limits. The surviving details—especially the shared cottage, the weekly discussions, and Julius’s attentive pride—show the private family life that accompanied Robert’s increasingly public career.