
Nobel Prize in Physics · 1921
Albert Einstein
He showed that light comes in packets and that gravity is curved space and time, ideas now built into solar cells, lasers and GPS.
The Nobel citation: “for his services to Theoretical Physics, and especially for his discovery of the law of the photoelectric effect”
- Born
- March 14, 1879, Ulm, Germany
- Died
- April 18, 1955, Princeton, NJ, USA
- Affiliation at the time
- Kaiser-Wilhelm-Institut (now Max-Planck-Institut) für Physik, Germany
Physics prize
1921
Awarded alone.
Age that year
42years
Born in 1879.
Headline credited impact
$142–160billion in economic value
Cumulative world semiconductor sales, a proxy for the quantum-based electronics economy. How it was built
Sources cited
45
Fact-checked September 24, 2026.
- His Nobel Prize singled out his law of how light knocks electrons out of metal, not relativity. He was first nominated in 1910 and received the prize in 1922.
- Clocks on GPS satellites run fast by about 38 millionths of a second a day, as relativity predicts, so they are set to tick slower before launch.
- In 1933 prominent Americans set up a relief group for Hitler's victims at his request. It grew into the International Rescue Committee.
- In 1933 the Nazis raided his homes, seized his bank account and property, and burned his book on relativity.
- Israel offered him its presidency in 1952, and he declined. He left his papers and literary rights to the Hebrew University of Jerusalem, which he helped found.
The breakthrough
Light comes in packets, and gravity bends space and time (1905-1915)
In 1905, while working as a patent examiner in Bern, Einstein wrote four papers in a few months that changed physics. The one the Nobel committee singled out solved a puzzle called the photoelectric effect. Light shining on a metal can knock electrons out of it, but only if the light's frequency, roughly its color, is high enough. Bright red light may free no electrons from a metal, while dim ultraviolet light can. Einstein proposed that light travels in separate packets of energy, later called photons, each carrying an amount of energy set by its frequency, and that one packet frees one electron. Think of a vending machine that takes only one coin at a time: a thousand pennies buy nothing, but one coin of the right value works. Experiments by the American physicist Robert Millikan later confirmed his law. That same year Einstein explained the jiggling of tiny particles in water as proof that atoms exist, and he introduced special relativity: measurements of time and space depend on how you move, and mass and energy are two forms of the same thing, E=mc². In 1915 he completed general relativity, which explains gravity as matter warping space and time. In 1919 British astronomers photographed starlight bending around the sun just as he had predicted.[1],[3],[4],[10],[13],[14],[15]
“Much as I feel myself a Jew, I feel far removed from traditional religious forms.”
What it meant for humanity
Einstein's ideas left the blackboard and entered everyday life. His law of the photoelectric effect is the principle behind photodiodes in fiber-optic networks, solar cells and camera image sensors; when the inventors of the CCD image sensor won the 2009 Nobel Prize, the Royal Swedish Academy of Sciences noted that their device relies on the effect he explained. His 1916 insight that light can stimulate atoms to release more light is at the heart of the laser. Relativity, whose effects once seemed too small to matter in daily life, now keeps satellite navigation accurate. GPS satellite clocks gain about 38 millionths of a second a day compared with clocks on the ground, so engineers set them to tick slower before launch; left uncorrected, the drift would add roughly 10 kilometers of position error each day. A 2019 study for the US National Institute of Standards and Technology valued GPS's benefits to the US private sector at about $1.4 trillion from 1984 to 2017. His predictions also opened new sciences: Bose-Einstein condensates and gravitational waves, both foreseen by him, earned Nobel Prizes after they were finally observed in 1995 and 2015. He used his fame for people as well as physics. In 1933 he prompted prominent Americans to found the relief group that became the International Rescue Committee, and he worked with committees that tried to find new homes for Jewish and political refugees, including displaced scholars. He helped found the Hebrew University of Jerusalem, protested racial injustice in America, and from 1946 chaired the Emergency Committee of Atomic Scientists, which pressed for international control of nuclear energy.
- NobelPrize.org lists photodiodes for fiber optics, solar cells and imaging as uses of his photoelectric law, and the 2009 physics prize announcement says the CCD camera sensor relies on it.[4],[7]
- His 1916 prediction that light passing through matter can stimulate the emission of more light is the principle at the heart of the laser.[16]
- GPS needs his equations: relativity makes satellite clocks run fast by about 38 microseconds a day, enough to throw positions off by about 10 kilometers a day if left uncorrected.[17],[33],[43]
- Two later Nobel Prizes, in 2001 and 2017, went to scientists who finally observed things he predicted: Bose-Einstein condensates and gravitational waves.[8],[9]
- At his request, 51 prominent Americans set up a New York branch of his relief association in July 1933 to aid people suffering under Hitler's regime; the International Rescue Committee grew from it.[30]
Impact in numbers
Einstein changed how people understand light, matter, space, time and gravity, and much of that value cannot be counted: modern cosmology, black-hole astronomy and gravitational-wave observatories all rest on his equations. We record only narrow, conservative numbers. For GPS, which needs relativity corrections to stay accurate, we credit him 2% of the measured benefit to US industry, because atomic clocks, satellites, computing and system engineering were equally essential. For the quantum-based electronics economy we credit him 1%, shared with the many other founders of quantum theory. For solar power, which the Nobel Prize website lists as an application of his photoelectric law, we credit him 1% of the carbon emissions it has avoided, because the photovoltaic effect was observed long before him and practical solar cells took decades of later invention. On the harm side, we attribute 1% of the Hiroshima and Nagasaki deaths to him for signing the 1939 letter to Roosevelt; he did no weapons work and later regretted the letter. His rescue and refugee work has no credible number.
Fundamental scienceTechnologyEconomyEnvironmentPeaceHuman rights
Each number is the laureate’s credited share of a real-world outcome, cumulative to 2025. The whole outcome, the share of credit, and the reasoning are shown so you can check the arithmetic. Outcomes shared with other laureates are counted once on the impact page.
- Low confidenceRippleModeledTechnology
Economic benefits of GPS to US private industry, which depends on relativity corrections
$64–128
billion in economic value, credited share
That is 2% of $3.2–6.4 trillion in economic value since 1984.
How this number was built
RTI International's 2019 study for NIST puts US private-sector GPS benefits for 1984-2017 at about $1.4 trillion, range $903 billion-$1.8 trillion (2017 dollars). Its Figure ES-1 shows about $300 billion of benefit in 2017 alone; scaling by the study's own range gives $200B-$400B a year. For 2018-2025 we hold that rate flat, with no further growth: 8 x $200B = $1.6T (low) and 8 x $400B = $3.2T (high). Totals $2.50T-$5.00T in 2017 dollars; BLS CPI-U (313.689 / 245.120 = 1.28) gives about $3.2T-$6.4T in 2024 dollars. Other countries excluded. Share 0.02: Ashby shows GPS clocks would drift unacceptably without relativistic corrections, but atomic clocks, satellites, signal design and computing were equally essential.[17],[33],[34],[35],[43]
Sources: National Institute of Standards and Technology (NIST); US Bureau of Labor Statistics; Living Reviews in Relativity, via PubMed Central; American Institute of Physics, Center for History of Physics; Ohio State University, Department of Astronomy
- Low confidenceRippleModeledEconomy
Cumulative world semiconductor sales, a proxy for the quantum-based electronics economy
$142–160
billion in economic value, credited share
That is 1% of $14.2–16 trillion in economic value since 1955.
How this number was built
Same whole-outcome range as the Niels Bohr profile. WSTS worldwide semiconductor billings for 1986-2025 sum to $10.28 trillion nominal, about $14.2 trillion in 2024 dollars using BLS CPI-U annual averages (low). High ($16T): $14.2T + rough, unsourced allowances of ~$0.5T for pre-1986 chip sales and ~$1T for lasers and other quantum devices outside WSTS = ~$15.7T, rounded up. NIST notes that quantum science underpins lasers and transistors. Share 0.01: Einstein supplied founding ideas (light quanta in 1905, quantum heat of solids, stimulated emission in 1916), but quantum theory had many authors, and materials science and engineering were equally essential.[3],[16],[35],[36],[37]
Sources: World Semiconductor Trade Statistics (WSTS); US Bureau of Labor Statistics; National Institute of Standards and Technology (Taking Measure blog); American Institute of Physics, Center for History of Physics; NobelPrize.org
- Low confidenceRippleModeledEnvironment
CO2 emissions avoided by solar photovoltaic electricity
44.5–69.9
million t CO₂e avoided, credited share
That is 1% of 4.5–7 billion t CO₂e of emissions avoided since 1983.
How this number was built
Ember data (via Our World in Data) give cumulative world solar generation for 1983-2025 of about 12,713 TWh, including 2,778 TWh in 2025. Ember puts the world's average power-sector intensity at 473 gCO2/kWh in 2024 (peak 555 in 2007). Assuming each solar MWh displaced 0.35-0.55 tCO2, bracketing that average to allow for solar's own life-cycle emissions and uncertainty about what it replaced: 12,713 TWh x 0.35 = 4.45 Gt (low); x 0.55 = 6.99 Gt (high). Share 0.01: the Nobel Foundation lists solar cells as an application of his photoelectric law, but the photovoltaic effect was seen in 1839 and the first practical silicon cell (1954) needed semiconductor physics and decades of engineering.[4],[38],[39],[40],[42]
Sources: Our World in Data; Ember; Ember; NobelPrize.org; US Department of Energy, Office of Energy Efficiency and Renewable Energy
- HarmMedium confidenceRippleSourced totalPeace
Deaths from the atomic bombings of Hiroshima and Nagasaki within two to four months
1,500–2,460
deaths caused, credited share
That is 1% of 150,000–246,000 deaths caused since 1945.
How this number was built
The Radiation Effects Research Foundation estimates acute deaths within two to four months at 90,000-166,000 in Hiroshima and 60,000-80,000 in Nagasaki, so 150,000-246,000 in total (the same range as the Niels Bohr profile; later cancer deaths excluded). Share 0.01: Einstein signed the August 1939 letter, drafted with Szilard, that prompted Roosevelt's uranium committee, plus a second letter in 1940, but he did no bomb work and was denied clearance, and other pressures such as the British MAUD report also drove the project. The bomb's builders and the decision to use it carry nearly all the responsibility.[20],[31],[32]
Sources: Radiation Effects Research Foundation (RERF); Atomic Heritage Foundation, National Museum of Nuclear Science & History; American Institute of Physics, Center for History of Physics
The double edge
Einstein never built a weapon, but he helped start the race to the atomic bomb. In August 1939, urged by Leo Szilard, he signed a letter warning President Roosevelt that Nazi Germany might build uranium bombs and urging American research. Roosevelt set up a uranium committee, one of the steps that led to the Manhattan Project. Einstein was denied security clearance and did no bomb work. The bombs dropped on Hiroshima and Nagasaki in 1945 killed an estimated 150,000 to 246,000 people within two to four months. Germany's program never came close to a bomb, and Einstein later said that, had he known it would fail, he would not have taken any part. He spent his last decade campaigning for nuclear arms control. His equation E=mc² explains why nuclear reactions release so much energy, but it was not a blueprint for a weapon; the key step was the discovery of uranium fission by Otto Hahn and Fritz Strassmann, announced in early 1939. There is also a personal stain. Diaries from his 1922-23 travels, published in 2018, contain racist remarks about Chinese people and others, at odds with his later public stand against racism.
- Major
Signed the 1939 letter that helped launch the US atomic bomb project
In August 1939 Einstein signed a letter, drafted with Leo Szilard, warning President Roosevelt that Germany might build uranium bombs; a second letter followed in 1940. Roosevelt set up a uranium committee, a first step toward the Manhattan Project. Einstein did no weapons work. The bombs used on Hiroshima and Nagasaki killed an estimated 150,000 to 246,000 people within two to four months. He later said that, had he known Germany would fail to build a bomb, he would not have taken any part.[20],[31],[32],[44]
- Moderate
Racist remarks in his private travel diaries
Diaries he kept on a 1922-23 trip to Asia, Palestine and Spain, published by Princeton University Press in 2018, include xenophobic and racist remarks, especially about Chinese people. Their editor, Ze'ev Rosenkranz of the Einstein Papers Project, said they clash with Einstein's public image as a humanitarian. In later life Einstein publicly attacked racial prejudice in the United States.[21],[41]
Against the odds
Einstein's fame grew alongside organized antisemitism in Germany. From 1919 the German far right, including the young Nazi party, openly attacked Jews, and nationalists branded relativity as Jewish physics. In August 1920 a far-right activist, Paul Weyland, staged a rally against relativity in Berlin's Philharmonic hall, where antisemitic pamphlets and swastika pins were handed out. Two German Nobel physicists, Philipp Lenard and Johannes Stark, went on to promote an Aryan physics meant to replace his work. In June 1922 nationalists murdered Walther Rathenau, Germany's Jewish foreign minister, whom Einstein knew well, and Einstein pulled out of a scientific meeting fearing for his own life. When Hitler took power in January 1933, Einstein was teaching in California. Nazi propaganda singled him out, the Gestapo searched his Berlin apartment, and troopers ransacked his country house. He never went back. Landing in Belgium in March, he surrendered his passport and resigned from the Prussian Academy; the regime seized his bank account and property, and in May students burned his book on relativity. An April 1933 law began driving Jews out of the civil service, including university posts. Einstein settled in Princeton in October 1933 and spent years helping refugees, including scholars, find safety.
1920
Antisemitic attack
On 24 August 1920 a far-right activist, Paul Weyland, staged a rally against relativity at Berlin's Philharmonic hall, where antisemitic pamphlets and swastika pins were handed out. Einstein responded that the real grievance was that he was Jewish and liberal.[25],[26]
—
Discrimination
Nobel laureates Philipp Lenard and Johannes Stark attacked relativity on racial grounds and promoted an 'Aryan physics' to replace what they called Jewish physics; Nazi-aligned physicists kept up the campaign against his theory.[18],[26]
1922
Persecution
After ultra-nationalists assassinated Walther Rathenau, Germany's Jewish foreign minister and a man Einstein knew well, in June 1922, Einstein declined to speak at a scientific meeting in Leipzig because he feared for his life.[26]
1933
Persecution
After Hitler took power, Nazi officials denounced Einstein, the Gestapo searched the family's Berlin apartment several times, and troopers searched and later seized his country house at Caputh. His Berlin bank account and the rest of his German property were confiscated.[24],[25]
1933
Exile
On 28 March 1933 he surrendered his German passport in Belgium and resigned from the Prussian Academy of Sciences. The Nazi government put him on its first list of people whose citizenship was revoked, and he never returned to Germany.[18],[19],[24]
1933
Censorship
On 10 May 1933 his book on relativity was among works by more than 350 authors banned or burned by Nazi students in the Action against the Un-German Spirit.[26],[27]
1933
Discrimination
The Nazis' April 1933 civil-service law began removing Jews and political opponents from government posts, including university jobs. It at first exempted World War I veterans, officials serving since 1914, and those whose father or son died in the war; the Nuremberg Laws of 1935 ended the veterans' exemption.[24],[26],[28]
Jewish background
Einstein was born to Hermann Einstein and Pauline Koch, a middle-class German Jewish family he later called entirely irreligious. At nine he became intensely observant, keeping the Sabbath and kosher laws, but by 12 he had lost interest in religion and refused a bar mitzvah. By his own account, only after arriving in Berlin in 1914, at 35, did he grasp that Jews shared a common destiny. From 1919 he supported Zionism, and he helped found the Hebrew University of Jerusalem. He felt Jewish while staying apart from religious practice. He backed a Jewish homeland in Palestine that would protect Arab rights, declined Israel's presidency in 1952, and left his papers to the Hebrew University.[4],[10],[11],[18],[21],[22],[23]
Key dates
March 14, 1879
Born in Ulm, Germany, to Hermann Einstein and Pauline Koch, a middle-class Jewish family; the family soon moves to Munich.[1],[2],[4],[11]
1896
After failing the entrance exam in 1895 and finishing school in Aarau, enters the Swiss Federal Polytechnic in Zurich to train as a physics and mathematics teacher.[2],[4],[12]
June 1902
After two years of odd jobs, wins a post as a technical expert, third class, at the Swiss patent office in Bern.[10],[29]
1905
Publishes four landmark papers, on light quanta, Brownian motion, special relativity and E=mc², and earns his doctorate.[2],[4],[10],[13]
1914
Moves to Berlin for a research post and a professorship at the University of Berlin; in 1917 he becomes the first director of the new Kaiser Wilhelm Institute for Physics.[2],[10],[45]
1915
Completes the general theory of relativity, which describes gravity as matter warping space and time.[4],[14]
1919
British eclipse expeditions confirm that the sun's gravity bends starlight as he predicted, making him world famous.[10],[15]
April 2, 1921
Arrives in New York with Chaim Weizmann on a fundraising tour for the planned Hebrew University of Jerusalem.[10],[22],[23]
November 9, 1922
Named winner of the reserved 1921 Nobel Prize in Physics while on a voyage to Japan, 12 years after his first nomination; his Nobel lecture follows in July 1923.[1],[3],[4],[5],[6],[41]
March 28, 1933
With the Nazis in power, surrenders his German passport in Belgium and resigns from the Prussian Academy; the regime seizes his property.[24],[25]
October 17, 1933
Arrives in the United States to join the Institute for Advanced Study in Princeton; he never returns to Germany.[18],[25]
August 2, 1939
Signs the letter, drafted with Leo Szilard, warning President Roosevelt that Nazi Germany might build atomic bombs.[20],[31],[44]
1952
Declines an offer to become the second president of Israel.[2],[10],[21]
April 18, 1955
Dies in Princeton, New Jersey, leaving an unfinished draft of a speech for the anniversary of Israel's independence.[1],[21]
Sources
- 1.Albert Einstein - Facts · NobelPrize.org (Nobel Prize Outreach)
- 2.Albert Einstein - Biographical · NobelPrize.org (from Nobel Lectures, Physics 1901-1921, Elsevier, 1967), 1967
- 3.The Nobel Prize in Physics 1921 - Presentation Speech by S. Arrhenius · NobelPrize.org, 1922
- 4.Albert Einstein - Questions and answers · NobelPrize.org, 2008
- 5.Albert Einstein - Nominations · NobelPrize.org
- 6.Albert Einstein - Nobel Lecture: Fundamental ideas and problems of the theory of relativity (Gothenburg, 11 July 1923) · NobelPrize.org, 1923
- 7.The Nobel Prize in Physics 2009 - Press release · NobelPrize.org (Royal Swedish Academy of Sciences), 2009
- 8.The Nobel Prize in Physics 2001 - Press release · NobelPrize.org (Royal Swedish Academy of Sciences), 2001
- 9.The Nobel Prize in Physics 2017 - Press release · NobelPrize.org (Royal Swedish Academy of Sciences), 2017
- 10.Albert Einstein in Brief (Einstein: Image and Impact exhibit) · American Institute of Physics, Center for History of Physics
- 11.Formative Years I (Einstein: Image and Impact exhibit) · American Institute of Physics, Center for History of Physics
- 12.Formative Years II (Einstein: Image and Impact exhibit) · American Institute of Physics, Center for History of Physics
- 13.Great Works (Einstein: Image and Impact exhibit) · American Institute of Physics, Center for History of Physics
- 14.Great Works II (Einstein: Image and Impact exhibit) · American Institute of Physics, Center for History of Physics
- 15.World Fame I (Einstein: Image and Impact exhibit) · American Institute of Physics, Center for History of Physics
- 16.The Quantum and the Cosmos I (Einstein: Image and Impact exhibit) · American Institute of Physics, Center for History of Physics
- 17.The Quantum and the Cosmos II (Einstein: Image and Impact exhibit) · American Institute of Physics, Center for History of Physics
- 18.Public Concerns II (Einstein: Image and Impact exhibit) · American Institute of Physics, Center for History of Physics
- 19.Public Concerns III (Einstein: Image and Impact exhibit) · American Institute of Physics, Center for History of Physics
- 20.The Nuclear Age I (Einstein: Image and Impact exhibit) · American Institute of Physics, Center for History of Physics
- 21.The Nuclear Age II (Einstein: Image and Impact exhibit) · American Institute of Physics, Center for History of Physics
- 22.Einstein's Complicated Relationship to Judaism, by Samuel Graydon · TIME, 2023
- 23.Prof. Albert Einstein · The Hebrew University of Jerusalem
- 24.Albert Einstein Quits Germany, Renounces Citizenship (History Unfolded: US Newspapers and the Holocaust) · United States Holocaust Memorial Museum
- 25.Anti-Semitism Drives Einstein From Berlin to America (Einstein and Yeshiva University) · Yeshiva University Libraries
- 26.How 2 Pro-Nazi Nobelists Attacked Einstein's "Jewish Science" (excerpt from Serving the Reich by Philip Ball) · Scientific American (University of Chicago Press excerpt), 2015
- 27.Bambi and the Theory of Relativity: Books on the Nazi Pyre · Jewish Museum Berlin
- 28.Law for the Restoration of the Professional Civil Service · United States Holocaust Memorial Museum, Holocaust Encyclopedia
- 29.Einstein at the patent office · Swiss Federal Institute of Intellectual Property
- 30.Albert Einstein and the birth of the International Rescue Committee · International Rescue Committee
- 31.The Einstein-Szilard Letter - 1939 · Atomic Heritage Foundation, National Museum of Nuclear Science & History
- 32.Frequently Asked Questions: How many people died as a result of the atomic bombings? · Radiation Effects Research Foundation (RERF)
- 33.Relativity in the Global Positioning System, by Neil Ashby (Living Reviews in Relativity 6, 1) · Living Reviews in Relativity, via PubMed Central, 2003
- 34.Economic Benefits of the Global Positioning System (GPS), final report by RTI International · National Institute of Standards and Technology (NIST), 2019
- 35.Consumer Price Index for All Urban Consumers (CPI-U), series CUUR0000SA0 · US Bureau of Labor Statistics
- 36.Historical Billings Report (WSTS Blue Book monthly data, 1986 to date) · World Semiconductor Trade Statistics (WSTS), 2026
- 37.A Quantum Leap Forward: How Tiny Particles Can Bring Us Exciting New Tech, by Corey Stambaugh · National Institute of Standards and Technology (Taking Measure blog), 2025
- 38.Electricity generation from solar power (Ember and Energy Institute data) · Our World in Data, 2026
- 39.Global Electricity Review 2025 · Ember, 2025
- 40.Global Electricity Review 2026 · Ember, 2026
- 41.Albert Einstein's travel diaries from 1920s reveal racist views, "unpleasant" comments · CBS News, 2018
- 42.The History of Solar · US Department of Energy, Office of Energy Efficiency and Renewable Energy
- 43.Real-World Relativity: The GPS Navigation System, by Richard W. Pogge · Ohio State University, Department of Astronomy
- 44.Einstein-Szilard Letter (transcript of the letter to President Roosevelt, 2 August 1939) · Atomic Heritage Foundation, National Museum of Nuclear Science & History, 1939
- 45.Albert Einstein and the MPI for Physics (Our history) · Max Planck Institute for Physics
Fact-checked on September 24, 2026 by a separate AI fact-checking pass that re-opened the sources, with 17 corrections made. How we check
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