Thomas Addis

Thomas Addis was a physician-scientist, pioneer in the treatment of kidney disease, and outspoken advocate for civil rights and left-wing causes. His importance to J. Robert Oppenheimer lay not only in their personal friendship: through Addis, Oppenheimer’s support for Spanish Republican relief entered Communist channels, and their association later became a politically sensitive part of Oppenheimer’s record. Addis’s life joined scientific distinction to political engagement at a moment when that combination could be admired as public service and treated as a security suspicion.

Identity and Medical Career

Born in Edinburgh in 1881, Addis was raised in a strict Calvinist household and retained a religious sensibility into adulthood; even as a young doctor, he carried a small Bible in his pocket. He received his medical degree from the University of Edinburgh in 1905, then pursued postdoctoral research in Berlin and Heidelberg as a Carnegie Scholar. His scientific career became closely identified with blood and kidney disease: he was the first medical researcher to demonstrate that normal plasma could be used to treat hemophilia, and he later became a leading authority on nephritis.

In 1911, Addis became chief of the Clinical Laboratory at Stanford University School of Medicine in San Francisco. There he built a long career as a physician-scientist, writing two books on nephritis and more than 130 scientific papers. His work earned him national standing: in 1944 he was elected to the National Academy of Sciences. He combined research with clinical practice, a breadth that colleagues regarded as central to his distinction rather than a division between separate professional lives.

Political Commitments and Public Causes

Addis’s activism predated his relationship with Oppenheimer by decades. When war began in Europe in 1914, he raised funds for the British war effort in violation of U.S. neutrality laws. He was indicted in 1915, pardoned by President Woodrow Wilson in 1917, and became an American citizen the following year. Although he came from a privileged family—his uncle, Sir Charles Addis, was a director of the Bank of England—he developed a pronounced distaste for money and became a visible supporter of civil rights for Black people, Jews, and union members in California. He signed petitions and lent his name to civic organizations, and was a friend of longshoreman union leader Harry Bridges.

His political outlook also reflected international encounters. In 1935, Addis attended the International Physiological Congress in Leningrad and returned from the Soviet Union with favorable accounts of its progress in public health. He was particularly impressed by reports that Soviet doctors had experimented with human cadaveric kidney transplants as early as 1933. He subsequently lobbied for national health insurance, a campaign that eventually led the American Medical Association to expel him. His colleagues did not all regard his admiration for the Soviet system as discrediting: some treated it as an eccentricity of an esteemed scientist. Linus Pauling praised him as “a great man, of a rare sort—a combination of scientist and clinician,” while another colleague described him as an open-minded nonconformist who did not need to play safe.

That reputation existed alongside increasingly consequential political suspicion. By the late 1930s, the FBI was describing Addis as a major recruiter of white-collar professionals for the Communist Party. A 1944 FBI report characterized him as active in 27 Communist-front organizations in the San Francisco Bay Area during the preceding decade. Oppenheimer later thought Addis was either a Communist or close to one. At Stanford, however, his political commitments could also be understood as expressions of a consistent opposition to injustice: one colleague recalled that oppression wherever it occurred was a personal affront to him, and that his name appeared conspicuously among sponsors of organizations opposing fascism and supporting democracy.

Addis, Tatlock, and Oppenheimer

Jean Tatlock opened the way for Oppenheimer into the political circle that included Addis. In the winter of 1937–38, she introduced Oppenheimer to Addis, a distinguished Stanford professor who had encouraged her medical studies and served as her friend and mentor. Addis was also a friend of Haakon Chevalier and Linus Pauling, among others in Oppenheimer’s Berkeley circle. He and Oppenheimer quickly became good friends. Their connection rested partly on a shared breadth of interest: Oppenheimer admired Addis’s ability to bring poetry, music, economics, and science into his work without treating them as isolated pursuits.

The friendship acquired practical significance through support for the Spanish Republic. Addis had served intermittently for twelve years as chairman or vice-chairman of the United American Spanish Aid Committee, and first approached Oppenheimer for contributions in that capacity. By 1940, Addis said the committee had helped rescue thousands of refugees, including European Jews, from concentration camps in France. Oppenheimer was already sympathetic to the Spanish Republican cause, and Addis impressed him through a combination of intellectual rigor and organized commitment.

At a private meeting in his Stanford laboratory, Addis told Oppenheimer that if he wanted his money for the Spanish cause to do good, he should channel it through Communist organizations. Oppenheimer thereafter regularly gave Addis cash in person, usually at the laboratory or Addis’s home. He believed the money would go directly to the fighting effort, and later explained that he used cash because he thought contributions for military equipment, as opposed to medical aid, might not be entirely legal. Addis eventually suggested that Oppenheimer give the payments instead to Isaac “Pop” Folkoff, a veteran member of the Communist Party of California who collected money from professionals around the movement.

Oppenheimer’s annual contributions through these channels amounted to about $1,000, a substantial sum in the 1930s. After the fascist victory in Spain in 1939, Addis and then Folkoff solicited money for other causes, including Communist Party efforts to organize California’s migratory farm workers. Oppenheimer’s last known contribution was apparently made in April 1942. The relationship therefore linked personal trust to a sustained sequence of donations, while the changing causes and recipients made that history more complicated than a single act of Spanish relief.

Scrutiny and Retrospective Significance

The later scrutiny of Addis shows how political associations could become a hazard even when the person at their center was no longer alive to answer accusations. When the FBI questioned Oppenheimer about Addis in 1950, Oppenheimer refused to discuss him, saying Addis was dead and could not defend himself against claims that he had been close to the Communist Party. Addis’s widow likewise did not want his political views discussed in a memorial essay for the National Academy of Sciences; she and her two children feared for their safety. Their concern gives a stark measure of the atmosphere surrounding the public memory of his activism.

Addis died in 1949, with a record that resisted simple division into scientific achievement on one side and political controversy on the other. He was a leading medical researcher, a physician whose work reached beyond the laboratory, and an organizer who connected Oppenheimer’s sympathy for the Spanish Republic to Communist fundraising networks. The book’s account places his choices within a wider historical shift: Depression-era political and civic activity could provide a young academic with companionship and a sense of participation in the life of his country, yet those same associations could later be recast as evidence against a public figure. Addis’s friendship with Oppenheimer thus illuminates both the substance of their shared political world and the vulnerability of its participants to later suspicion.