Albert Einstein is widely celebrated as one of the greatest scientific minds in human history. His theory of relativity transformed our understanding of space, time and gravity, while his famous equation, E = mc², became one of the most recognisable symbols of modern science. His distinctive appearance, unconventional personality and outspoken views on peace and human rights helped turn him into a global cultural icon.

However, behind the image of the absent-minded genius and humanitarian was a complicated individual whose private writings, family relationships and political decisions raise uncomfortable questions about his character.

Einstein was not simply a scientist who changed the world through his discoveries. He was also a man shaped by the prejudices of his time, a husband whose personal relationships were marked by serious difficulties, and a political figure who struggled with the moral consequences of scientific progress. His private travel diaries, in particular, revealed racist and dehumanising observations about Asian people that conflicted sharply with his later public opposition to racism.

Examining the darker aspects of Einstein’s life does not diminish his scientific achievements. Instead, it provides a more complete understanding of a historical figure whose intellectual brilliance did not always translate into personal wisdom or consistent moral judgement.

1. The Racist Views Revealed in His Private Diaries

One of the most disturbing discoveries about Einstein’s personal outlook emerged in 2018, when his travel diaries from 1922 and 1923 received widespread attention following their publication in English.

The diaries documented his journey through parts of Asia and the Middle East, including Hong Kong, Singapore, China, Japan and Palestine. Edited by Ze’ev Rosenkranz and published by Princeton University Press, The Travel Diaries of Albert Einstein: The Far East, Palestine, and Spain, 1922–1923 offered readers a glimpse into the scientist’s private reactions to the people and cultures he encountered.

Some of his observations were shockingly prejudiced.

While travelling in China, Einstein described Chinese people using derogatory terms and portrayed them as intellectually inferior. He also expressed discomfort at the possibility that Chinese people might increase in number and displace other racial groups. His remarks went beyond criticism of particular customs or living conditions: they relied on sweeping stereotypes about an entire population.

The comments are especially troubling because Einstein was not merely recording isolated disagreements with individuals. He sometimes generalised from brief encounters to make sweeping judgements about the character, intelligence and behaviour of millions of people.

His descriptions of other Asian populations also contained ethnic stereotypes and assumptions about racial differences. These passages exposed a side of Einstein that was difficult to reconcile with the humanitarian reputation he would later acquire.

The significance of these writings lies partly in their private nature. Unlike public speeches, which may be shaped by political expectations or the desire to persuade an audience, private diaries can reveal prejudices that a writer might not express openly. Einstein’s notes therefore provide important evidence of attitudes that were inconsistent with the universal humanism associated with his later public life.

Historical context is important, but it cannot erase the substance of the remarks. Racist ideas were widespread in early twentieth-century Europe, and theories claiming that human populations could be ranked by intelligence or biological worth enjoyed considerable influence. Nevertheless, such beliefs were contested even during Einstein’s lifetime. Their prevalence does not make them harmless or inevitable.

The diaries demonstrate that a person capable of extraordinary intellectual originality can still accept damaging social assumptions without subjecting them to the same critical scrutiny applied to scientific problems.

2. The Contradiction Between His Racism and His Civil Rights Advocacy

Perhaps the most striking feature of Einstein’s racial prejudice is that it existed alongside genuine opposition to racism during the later decades of his life.

After escaping Nazi Germany and settling in the United States, Einstein became an increasingly vocal critic of racial discrimination. He recognised similarities between antisemitism in Europe and the segregation and racial oppression experienced by Black Americans.

In 1931, he publicly supported the campaign surrounding the Scottsboro Boys, a group of Black teenagers falsely accused of raping two white women in Alabama. Their prosecution became an international symbol of racial injustice in the American legal system.

Einstein also contributed to The Crisis, the magazine associated with the National Association for the Advancement of Colored People, and supported civil rights causes. In 1946, he delivered an address at Lincoln University, a historically Black institution in Pennsylvania, in which he condemned racial segregation.

He declared that segregation was “not a disease of colored people. It is a disease of white people.”

This statement remains one of the clearest expressions of his opposition to racial discrimination.

Yet the contrast between these public positions and his earlier private diaries cannot be ignored. The same man who condemned racism in America had previously written dehumanising descriptions of Asian populations.

Did Einstein change his views as he grew older? His experiences with antisemitism, the rise of Nazism and American segregation may have influenced his understanding of racial oppression. His later activism was meaningful and should not be dismissed as mere public relations.

However, historians cannot confidently conclude that he completely abandoned every prejudice expressed in his diaries. The records reveal a complicated evolution rather than a perfectly documented transformation.

The uncomfortable lesson is that opposition to discrimination in one setting does not automatically eliminate prejudice in another. People can recognise injustice when they or those they sympathise with experience it while remaining blind to their own assumptions about other groups.

Einstein’s life illustrates this contradiction with unusual clarity. His advocacy for civil rights deserves recognition, but it does not erase the harm represented by his private writings.

3. His Troubled Marriage to Mileva Marić

Einstein’s first marriage, to Serbian physicist Mileva Marić, is another important part of the story behind his public image.

Marić was an intelligent and ambitious student who studied mathematics and physics at the Swiss Federal Polytechnic in Zurich, where she met Einstein in the late nineteenth century. Their relationship developed through shared intellectual interests, scientific discussions and personal correspondence.

Their surviving letters show that their early relationship involved serious scientific ambitions. Both discussed physics, research and the possibility of working together. In some letters, Einstein used language suggesting that he regarded their research as a joint undertaking.

In one letter dated 27 March 1901, Einstein wrote to Marić about how happy and proud he would be when they had brought their work on relative motion to a successful conclusion.

Such correspondence has contributed to decades of debate about Marić’s intellectual contribution to Einstein’s early scientific development.

Some writers have argued that she played a substantial role in his discoveries, while others have challenged claims that she co-authored his celebrated 1905 papers or supplied the mathematics for his theories. The surviving evidence does not establish that she co-authored those landmark publications. It is therefore important to distinguish evidence of intellectual companionship and discussion from claims of scientific authorship that cannot be conclusively demonstrated.

What is clear is that Marić’s scientific ambitions did not develop into a comparable professional career. She did not obtain a degree, and she ultimately devoted much of her life to family responsibilities.

The couple married in 1903 and had two sons, Hans Albert and Eduard. They also had a daughter, Lieserl, born in 1902 before their marriage. The surviving historical record contains little definitive information about Lieserl’s later life, and her fate remains uncertain.

The deterioration of Einstein and Marić’s relationship became particularly painful. They eventually lived apart, and their marriage ended in divorce in 1919.

The darker side of this history concerns the imbalance between Einstein’s expanding public reputation and the personal sacrifices and difficulties experienced within his family. While his career advanced, Marić faced domestic responsibilities and the challenges of caring for their children, including Eduard, who later developed serious mental health difficulties.

It would be inaccurate to portray Marić as the undisputed, unrecognised author of Einstein’s greatest discoveries. It would be equally simplistic, however, to overlook her own ambitions and the sacrifices associated with their relationship.

Their marriage raises broader questions about how the history of science remembers women who shared the intellectual and personal lives of celebrated male scientists. Einstein became a global icon; Marić’s life and work received far less public recognition.

That difference does not by itself prove that Einstein deliberately stole her discoveries. It does, however, invite a closer examination of the personal and professional circumstances in which his career flourished.