All Thinkers

Albert Einstein

Albert Einstein was a German-born theoretical physicist. He is widely seen as the most influential scientist of the twentieth century. He was born on 14 March 1879 in Ulm, in southern Germany. His family was secular Jewish and middle class. His father ran an electrochemical business that often struggled. His mother was a musician who pushed Albert to play the violin from age five. He had one younger sister, Maja. As a child, he was shy and slow to speak, but fascinated by science. A compass given to him at age five made him wonder about invisible forces. He found regular school dull. At sixteen he ran away from his German school. He finished his education in Switzerland and entered the Swiss Federal Polytechnic School in Zurich in 1896. He graduated in 1900. He could not find a teaching post and took a job at the Swiss Patent Office in Bern. There, in his spare time, he produced his most famous work. In 1905, his 'miracle year', he published four papers that changed physics: on the photoelectric effect, Brownian motion, special relativity, and the equation E=mc². Fame followed slowly. He held professorships in Zurich, Prague, and Berlin. In 1915 he completed the general theory of relativity. He won the Nobel Prize in Physics for 1921. In 1933, the Nazis came to power. Einstein, who was Jewish, was already in the United States and never returned to Germany. He took a position at the Institute for Advanced Study in Princeton, where he worked until his death on 18 April 1955, aged 76.

Origin
Germany / United States
Lifespan
1879-1955
Era
Late 19th-20th Century
Subjects
Physics Relativity Quantum Theory Scientific Genius Twentieth Century Science
Skills
Scientific Thinking Critical Thinking Problem Solving Creative Expression Ethical Thinking
Why They Matter

Einstein matters for three reasons. First, he changed how we understand space, time, and gravity. His special theory of relativity (1905) showed that time and space are not the fixed background of the universe; they depend on the observer's motion. His general theory of relativity (1915) explained gravity as a curving of space and time around heavy objects. These ideas sound abstract but are tested every day. Modern GPS, which guides phones and cars, only works because engineers correct for the small effects of relativity. Black holes, gravitational waves, and the Big Bang all come out of his framework.

Second, his equation E=mc² connected mass and energy. Tiny amounts of mass, the equation said, could be turned into huge amounts of energy. Forty years later, this equation lay behind the development of nuclear power and nuclear weapons. Einstein himself was a pacifist who feared this. He signed a 1939 letter warning that Nazi Germany might build an atomic bomb. The United States built one first. Einstein later said that if he had known the Germans would fail, he would have done nothing.

Third, he became a global symbol of science and conscience. His face is on T-shirts and posters everywhere. The popular image is harmless and often empty. The real Einstein was more interesting. He was an active pacifist, a Zionist who criticised Israeli policies, an early member of the American NAACP who called racism 'a disease', and a man with a complicated personal life. He showed that a great scientist could also be a public conscience.

Key Ideas
1
Special Relativity in One Idea
2
E=mc²
3
General Relativity: Gravity as Curved Spacetime
Key Quotations
"Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world."
— Interview with Saturday Evening Post, 26 October 1929
Einstein said this in a 1929 interview. He had spent his early career picturing scenes that no laboratory could test: trains travelling at the speed of light, falling lifts, light beams curving past stars. These thought experiments led to special and general relativity. He believed that real science was driven by imagination as much as by data. Knowledge could be looked up. Imagination could not. For students, the quote is an encouraging reminder that creative thinking is part of serious science. The best scientists are not just careful; they are also able to picture how the world might be different from how it seems.
"God does not play dice with the universe."
— Letter to Max Born, 4 December 1926; widely paraphrased
Einstein wrote a version of this in 1926 to fellow physicist Max Born. He was uncomfortable with quantum theory, which says that the smallest things in the universe behave randomly, not by fixed rules. Einstein believed there must be a deeper level where everything was determined and orderly. The line is famous, but Einstein turned out to be wrong on this point. Quantum randomness has been confirmed in many experiments. Niels Bohr is reported to have replied: 'Einstein, stop telling God what to do.' For students, the quote is a useful reminder that even the greatest scientists can be wrong on important questions. Real science is a community process, not a single mind's work.
Using This Thinker in the Classroom
Scientific Thinking When students first learn that science can challenge common sense
How to introduce
Tell students about the speed of light. No matter how fast you move, light always travels past you at the same speed. This sounds wrong. If you run after a moving car, the car appears slower; if you chase a beam of light, you would expect the same. Einstein showed it does not work that way for light. From this strange fact, time and space themselves become flexible. Ask students how they feel about this. Real science sometimes overturns common sense. The reward is that we understand the world more accurately. Einstein's example is one of the cleanest in modern science.
Creative Expression When teaching students about imagination as a tool for thinking
How to introduce
Share Einstein's quote that imagination is more important than knowledge. Ask students how this could be true. Einstein worked through thought experiments: imaginary trains, imaginary lifts, imaginary light beams. He pictured how the world might behave under conditions no lab could create. The pictures led to real physics. Ask students to try a small thought experiment of their own. What would happen if gravity stopped for one minute? If sound moved slower than walking pace? Imagination is not the opposite of careful thinking. It is part of it.
Problem Solving When discussing how breakthroughs happen
How to introduce
Tell students about Einstein's miracle year. He was 26, working as a patent clerk, with no university position. In one year he produced four papers that changed physics. Ask students: what does this story tell us about where great work comes from? Genius did not come from a famous laboratory. It came from one man, working in his evenings, with a notebook. Big ideas can come from anywhere. The conditions Einstein had (time to think, freedom from rigid expectations, exposure to many problems through patent work) are worth noticing. They are not glamorous. They are real.
Further Reading

For a first introduction, Walter Isaacson's biography Einstein: His Life and Universe (2007) is detailed, readable, and balanced. The 1970 essay collection Out of My Later Years gathers Einstein's accessible essays in his own voice. The Nobel Prize website has clear short biographies and his original lectures. For young readers, Don Brown's illustrated Odd Boy Out: Young Albert Einstein is excellent. The PBS documentary Einstein's Big Idea (2005) gives a strong visual introduction to E=mc² and its history.

Key Ideas
1
The Miracle Year (1905)
2
Light: Wave or Particle?
3
Refugee from Nazi Germany
Key Quotations
"The most incomprehensible thing about the universe is that it is comprehensible."
— Physics and Reality, essay published in Journal of the Franklin Institute, 1936
Einstein wrote this in a 1936 essay. He was thinking about a deep mystery. Why should the universe be understandable to human minds at all? Mathematics describes the world remarkably well. Theories like relativity, made up by humans, predict events with extraordinary accuracy. There is no obvious reason this should be possible. The universe could have been chaos. Instead it follows patterns we can grasp. Einstein found this almost miraculous. For students, the quote opens a serious philosophical question. Why does science work? The answer is not simple. Some think the universe really is mathematical at its core. Others think human minds shape what we see. The question has not been settled.
"Racism is a disease of white people."
— Speech at Lincoln University, Pennsylvania, May 1946
Einstein gave this speech at Lincoln University, a historically Black college, in 1946. He spoke clearly. American racism was a disease, and the cure had to come from white people changing themselves, not from Black people demanding change politely. The speech was rare for a famous white person at the time. Einstein had been deeply affected by Nazi Germany's antisemitism. He saw American racism as a similar disease in another setting. He joined the NAACP and corresponded with W. E. B. Du Bois. For students, the quote shows that one can hold the highest reputation in science and still speak directly about social injustice. Public engagement is not separate from the life of the mind. For Einstein, they were the same thing.
Using This Thinker in the Classroom
Critical Thinking When studying how scientific theories are tested
How to introduce
In 1919, two British expeditions photographed a solar eclipse to test Einstein's general relativity. The theory predicted that starlight passing near the Sun would bend by a specific amount. The photographs showed the bending. Einstein became famous overnight. Ask students: why does a single experiment have such authority in science? What if it had failed? Einstein himself said that no number of successful experiments could prove a theory; one good failed experiment could disprove it. This is the heart of how science works. Theories are taken seriously not because famous people propose them but because they survive serious tests.
Ethical Thinking When discussing scientific responsibility
How to introduce
Tell students about Einstein and the atomic bomb. He signed a letter in 1939 urging the US to develop nuclear weapons before Nazi Germany did. The bombs were used on Hiroshima and Nagasaki. Einstein said later that if he had known Germany would fail, he would not have signed. Ask students: what responsibility do scientists have for how their work is used? Was Einstein right to sign the letter, given what he knew at the time? Was he right to regret it later? This is a serious ethical conversation. Modern parallels include AI, climate engineering, and biotechnology.
Further Reading

For deeper reading, Einstein's own short book Relativity: The Special and the General Theory (1916) is surprisingly accessible. Brian Greene's The Elegant Universe places relativity in modern theoretical physics.

Abraham Pais's Subtle Is the Lord

The Science and Life of Albert Einstein (1982) is the standard scientific biography.

Albrecht Fölsing's Albert Einstein

A Biography is comprehensive on personal life. For Einstein's letters, the multi-volume Collected Papers of Albert Einstein, published by Princeton, is the major scholarly resource.

Key Ideas
1
The Atomic Bomb Letter and Its Aftermath
2
Public Conscience: Pacifism, Civil Rights, Israel
3
The Personal Einstein
Key Quotations
"I do not know with what weapons World War III will be fought, but World War IV will be fought with sticks and stones."
— Quoted in Liberal Judaism, April-May 1949; widely attributed
Einstein said this at the height of the early atomic age. After Hiroshima and Nagasaki, he campaigned tirelessly against nuclear weapons. The line is grimly funny. A third world war would use nuclear weapons. After a nuclear war, civilisation would be destroyed. Any survivors fighting a fourth world war would be back to sticks and stones. The joke makes a serious point. Nuclear weapons are not just bigger versions of old weapons. They could end human civilisation. For advanced students, the quote is a powerful piece of moral seriousness from a man whose own equation made the bomb possible. Einstein took the responsibility seriously. The world is still working out what to do with what science has given it.
"Concern for man himself and his fate must always form the chief interest of all technical endeavours, in order that the creations of our mind shall be a blessing and not a curse to mankind."
— Address to students at the California Institute of Technology, 16 February 1931
Einstein gave this address to engineering students at Caltech in 1931. He warned them that scientific and technical progress alone was not enough. Without serious moral concern for human welfare, technology could become a curse rather than a blessing. He spoke years before the atomic bomb existed. He spoke decades before computers, the internet, and artificial intelligence. The warning has only become more relevant. For advanced students, the quote is a foundational statement of scientific responsibility. Brilliant work that ignores its human consequences is not enough. The same principle now applies to climate science, biotechnology, and AI. The technical and the moral cannot be cleanly separated.
Using This Thinker in the Classroom
Ethical Thinking When discussing public roles for scientists and intellectuals
How to introduce
Einstein was a Nobel-winning physicist. He was also an active pacifist, civil rights supporter, NAACP member, and critic of nuclear weapons. He used his fame to speak about social and political questions. Ask students: should scientists stick to their field, or should they speak out on public issues? What are the risks each way? Einstein's view was clear: he had a duty to speak. Other scientists have argued the opposite. Discuss the trade-offs. Apply the question to today: should climate scientists campaign for policy change? Should AI researchers warn about their own field? There is no single right answer.
Critical Thinking When examining how famous figures are simplified by popular memory
How to introduce
The Einstein on T-shirts and posters is a friendly old man with wild hair. The real Einstein was more complicated. He was a serious thinker about war, race, and politics. He treated his first wife badly and was distant from his children. His son Eduard had schizophrenia and was largely abandoned. His daughter Lieserl disappeared from the record. Ask students: why do societies simplify famous people into cartoons? What is lost? Apply the same question to other figures: Mandela, Gandhi, Marie Curie. Real human beings rarely fit on a T-shirt. Honest study of any historical figure means looking past the icon to the person.
Common Misconceptions
Common misconception

Einstein failed maths at school.

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What to teach instead

He did not. This is one of the most famous false stories in popular culture. Einstein excelled at maths from an early age. By twelve he was studying calculus on his own. He did struggle with rote learning at school and clashed with strict German teachers, but he was always strong in mathematics. The 'failed maths' myth probably grew because his school grading scale changed in his youth (a 6 went from worst to best), making old reports look worse than they were. The myth is sometimes used to comfort students who struggle. The truth is more useful: Einstein worked hard at mathematics his whole life, and his great breakthroughs depended on serious mathematical skill, often borrowed from his friend Marcel Grossmann.

Common misconception

Einstein invented the atomic bomb.

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What to teach instead

He did not. He never worked on the Manhattan Project. The FBI denied him a security clearance because of his pacifist politics. He did sign a 1939 letter to President Roosevelt urging the United States to research nuclear weapons before Nazi Germany did. His equation E=mc² describes the relationship between mass and energy that is at work in any nuclear reaction. But the actual bomb was built by other physicists, including J. Robert Oppenheimer's team. Einstein learned about Hiroshima from the radio. He spent the rest of his life campaigning against nuclear weapons.

Common misconception

Einstein won the Nobel Prize for relativity.

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What to teach instead

He did not. He won the 1921 Nobel Prize in Physics for his explanation of the photoelectric effect, the work that helped found quantum theory. Relativity was still considered controversial in some scientific circles in the early 1920s. The Nobel committee chose a less debated achievement. This is a useful reminder that even the world's most famous prizes do not always recognise a thinker's most important work. Einstein's lasting fame rests mostly on relativity, which the Nobel did not directly award.

Common misconception

Einstein was politically neutral or apolitical.

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What to teach instead

He was deeply political. He was a lifelong pacifist who refused military service as a young man. He was an active Zionist who helped found Hebrew University but criticised some Israeli policies. He was a member of the NAACP and corresponded with W. E. B. Du Bois on civil rights. He campaigned for nuclear disarmament. He was a socialist sympathiser who once wrote an essay called 'Why Socialism?'. The FBI kept a 1,400-page file on him. The myth of the apolitical scientist genius does not fit Einstein. Many of his most famous public statements were political.

Intellectual Connections
Develops
Isaac Newton
Newton's theory of gravity dominated physics for over 250 years. Einstein's general relativity replaced Newton's, treating gravity not as a force but as the curvature of spacetime around massive objects. Newton's theory still works perfectly for everyday situations, like building bridges or sending rockets to the Moon. Einstein's theory takes over in extreme situations, like near black holes or at the scale of the universe. Each man revolutionised physics in his own century. Reading them together is a master class in how scientific revolutions actually work: they do not always destroy old theories, they sometimes contain them as special cases.
In Dialogue With
Emmy Noether
Noether, a brilliant German mathematician, helped Einstein and David Hilbert solve mathematical problems in general relativity around 1915. Her famous 'Noether's theorem' (1918), which connects symmetries in physics to conservation laws, is one of the deepest results in modern physics. It came directly out of work she did supporting Einstein's theory. Einstein recognised her genius and called her one of the greatest mathematicians of her time. Reading them together shows how major theories rarely come from one person. Even Einstein needed great mathematical collaborators. Noether's work is one of the most important and most overlooked contributions to twentieth-century physics.
Anticipates
Marie Curie
Curie, who won Nobel Prizes in Physics (1903) and Chemistry (1911), discovered radioactivity in the late 1890s. Her work showed that atoms were not stable units but could break apart, releasing energy. Einstein's E=mc² (1905) explained where this energy came from: small amounts of mass were being converted into energy. Curie's experimental discovery and Einstein's theoretical equation fit together. Both helped open the atomic age. Curie also faced sexism and personal attacks during her career, much as Einstein later faced antisemitism. Reading them together gives students a fuller picture of how early twentieth-century physics actually developed across countries and across genders.
In Dialogue With
W. E. B. Du Bois
Du Bois and Einstein corresponded for years. Both saw American racism as a fundamental moral failure of the country they had each, in different ways, made their home. Einstein joined the NAACP, which Du Bois had co-founded. Einstein's 1946 Lincoln University speech calling racism 'a disease of white people' echoed arguments Du Bois had been making for decades. Their friendship is a small but important example of how scientific genius and political activism could meet across different fields. It also reminds students that famous figures are often part of wider intellectual communities, not lone heroes.
Complements
Bertrand Russell
Russell, the British philosopher and logician, and Einstein together drafted the 1955 Russell-Einstein Manifesto, which called for nuclear disarmament. Einstein signed the document just days before his death. The manifesto led to the Pugwash Conferences, which brought scientists from East and West together during the Cold War to work on reducing nuclear danger. Pugwash won the Nobel Peace Prize in 1995. Russell and Einstein represent two of the most powerful intellectual voices for nuclear sanity in the post-Hiroshima world. Their cooperation across philosophy and physics is a model for how thinkers from different fields can act together on great public questions.
Develops
Galileo Galilei
Galileo, in the early seventeenth century, established that the laws of physics are the same for all observers moving at constant velocity. This 'Galilean relativity' is the foundation Einstein built on. Special relativity (1905) extended Galileo's principle to include the speed of light, which led to the strange but tested consequences about time and space. Einstein himself said he was simply taking Galileo's idea seriously to its logical conclusion. Reading them together shows how scientific progress often happens: a great early thinker establishes a principle, and a later thinker pushes it into new territory it could not reach alone.
Further Reading

For research-level engagement, Albert Einstein's own 'Autobiographical Notes' in Paul Schilpp's Albert Einstein: Philosopher-Scientist (1949) is essential. Don Howard and John Stachel's Einstein: The Formative Years gathers important historical and philosophical work. Kip Thorne's Black Holes and Time Warps explores Einstein's theory through to modern astrophysics. For the ethical legacy, Robert Jungk's Brighter Than a Thousand Suns and Richard Rhodes's The Making of the Atomic Bomb are standard. The Albert Einstein Archives at the Hebrew University of Jerusalem hold his papers and are increasingly available online.