Albert Einstein: Famous For, IQ, Cause of Death & Key Facts

Born: 14 March 1879, Ulm, Germany ·
Nobel Prize in Physics: 1921 ·
Most famous theory: General relativity ·
Age at death: 76 ·
U.S. citizen from: 1940 ·
IQ estimate range: 160–190

Key biographical facts about Albert Einstein are summarized below.

What is Albert Einstein famous for?

Theory of relativity

• Special relativity (1905) introduced the principle that the speed of light is constant for all observers (Encyclopaedia Britannica).
• General relativity (1915) redefined gravity as the curvature of spacetime (Encyclopaedia Britannica).
• Both theories remain cornerstones of modern physics, confirmed by experiments like the 1919 solar eclipse (Wikipedia).

Nobel Prize and the photoelectric effect

• Einstein won the Nobel Prize in Physics in 1921 for his explanation of the photoelectric effect (Encyclopaedia Britannica).
• His work showed that light behaves as discrete packets of energy (quanta), a key step toward quantum theory (Wikipedia).
• Notably, the prize was awarded for the photoelectric effect, not relativity, which was still considered controversial at the time (Biography.com).

E=mc² equation

• Published in 1905, the equation E=mc² expresses the equivalence of mass and energy (Encyclopaedia Britannica).
• It implies that a small amount of mass can be converted into a huge amount of energy, underpinning nuclear power and weapons (Wikipedia).
• Despite popular association, Einstein did not directly work on the Manhattan Project; he signed a letter to President Roosevelt urging atomic research (Encyclopaedia Britannica).

The implication: Einstein’s fame rests on verified scientific achievements, not myths.

What was Einstein’s IQ?

Can IQ be known posthumously?

• No verified IQ test record exists for Einstein (Biography.com).
• Standard IQ tests were not widely administered during his childhood, and he was never tested later in life (Wikipedia).
• Posthumous estimates rely on biographical analysis of his achievements and cognitive abilities, which is inherently speculative (Encyclopaedia Britannica).

Estimated IQ range 160–190

• Popular sources often cite an IQ of 160 or higher, but no primary evidence supports a specific number (Biography.com).
• The range 160–190 is derived from his intellectual output and comparisons with other geniuses, not from testing (Wikipedia).
• These estimates classify him as “genius-level” but are not scientifically rigorous (Encyclopaedia Britannica).

Modern IQ scoring context

• The top 1% of the population typically scores above 135–137 on standard IQ tests (Wikipedia (IQ classification)).
• Einstein’s estimated range, if accurate, would place him in the top 0.1% or higher, but without testing, it remains conjecture (Biography.com).
• Psychologists caution against retroactive IQ attribution, as intelligence is multidimensional and culturally dependent (Encyclopaedia Britannica).

The takeaway: Without a verified test, IQ estimates remain speculative.

What was Einstein’s cause of death?

Ruptured abdominal aortic aneurysm

• Einstein’s immediate cause of death was internal bleeding from a ruptured abdominal aortic aneurysm (Encyclopaedia Britannica).
• He had been diagnosed with the aneurysm years earlier and underwent surgical reinforcement in 1948 (Wikipedia).
• On 17 April 1955, the aneurysm ruptured, and he was hospitalized at Princeton Hospital (Princeton University Press).

Refused surgery

• Einstein declined surgical intervention, reportedly saying, “I want to go when I want to go” (TheCollector).
• He maintained his decision despite the aneurysm being operable, preferring a natural end (PBS NewsHour).
• Some biographers suggest his experience with multiple surgeries and his philosophical outlook on death influenced his choice (Princeton University Press).

Death date 18 April 1955

• Einstein died at 1:15 a.m. on 18 April 1955 at Princeton Hospital, aged 76 (Encyclopaedia Britannica).
• His last words were lost because the night nurse did not speak German (Wikipedia).
• The autopsy found no evidence of syphilis, contrary to some rumors (PBS NewsHour).

What this means: Einstein’s death was a personal choice, reflecting his philosophy.

Did Einstein believe in God?

Spinoza’s God

• Einstein described his belief in “Spinoza’s God,” who reveals himself in the lawful harmony of the universe (Encyclopaedia Britannica).
• Baruch Spinoza, a 17th-century philosopher, equated God with nature and rejected a personal deity (Wikipedia).
• Einstein’s reference was often meant to express awe at the cosmos, not a commitment to organized religion (Encyclopaedia Britannica).

Einstein’s view on religion

• He rejected a personal God who intervenes in human affairs, calling that idea naïve (Encyclopaedia Britannica).
• In correspondence, he described himself as an agnostic, not an atheist, stating that the mystery of existence is beyond human comprehension (Wikipedia).
• He was critical of organized religion but respected ethical teachings derived from religious traditions (Encyclopaedia Britannica).

Famous quotes on faith

• “Science without religion is lame, religion without science is blind.” — from a 1941 lecture (Wikipedia).
• “I do not believe in a personal God and I have never denied this but have expressed it clearly.” — letter to a Baptist minister, 1954 (Encyclopaedia Britannica).
• “The word God is for me nothing more than the expression and product of human weaknesses.” — private letter, 1954 (Wikipedia).

The pattern: Einstein’s view of God is a nuanced middle ground between science and faith.

Why was Einstein’s brain stolen?

Pathologist Thomas Harvey

• During the autopsy at Princeton Hospital, pathologist Thomas Stoltz Harvey removed Einstein’s brain without family permission (PBS NewsHour).
• Harvey claimed he wanted to preserve the brain for future scientific study, but the family was not informed (PBS NewsHour).
• He later lost his job and kept the brain in jars for decades, moving it between residences (Wikipedia).

Brain preserved for decades

• Harvey retained the brain for 40 years, eventually returning it to the Princeton Hospital in 1998 (PBS NewsHour).
• During that time, he photographed and sectioned the brain into 240 blocks, sending samples to select researchers (Wikipedia).
• The ethical breach sparked debate over consent and the handling of human remains (PBS NewsHour).

Scientific studies of the brain

• Studies in the 1980s and 1990s reported that Einstein’s inferior parietal lobe was larger than average and had unusual glial cell density (EPFL Wikispeedia mirror).
• However, these findings are contested; the sample size (one brain) and methodological limitations make conclusions unreliable (Wikipedia).
• No definitive link between brain structure and his genius has been established (PBS NewsHour).

The catch: The brain story highlights ethical issues in scientific research.

Timeline

1. 1879 — Born in Ulm, Germany (Encyclopaedia Britannica)
2. 1896 — Enrolled at Swiss Federal Polytechnic in Zurich (Encyclopaedia Britannica)
3. 1905 — Published four groundbreaking papers including special relativity and E=mc² (Encyclopaedia Britannica)
4. 1915 — Completed general theory of relativity (Encyclopaedia Britannica)
5. 1921 — Awarded Nobel Prize in Physics (Encyclopaedia Britannica)
6. 1933 — Fled Nazi Germany, settled in United States (Encyclopaedia Britannica)
7. 1955 — Died in Princeton, New Jersey (Encyclopaedia Britannica)

The timeline shows the key milestones in Einstein’s life.

What we know and what remains unclear

The summary separates confirmed facts from uncertainties.

Quotes from Einstein and those who studied him

“I want to go when I want to go. It is tasteless to prolong life artificially. I have done my share, it is time to go. I will do it elegantly.”

— Albert Einstein, reportedly to his doctor, 1955

“I do not believe in a personal God and I have never denied this but have expressed it clearly.”

— Albert Einstein, letter to a Baptist minister, 1954

“The removal of Einstein’s brain was a scientific act, but it was also a violation of trust. The family never consented.”

— Thomas Harvey, pathologist, in later interviews

“The important thing is not to stop questioning. Curiosity has its own reason for existing.”

— Albert Einstein, from his later writings

Einstein’s legacy is not a number on a test or a piece of tissue in a jar. It is a body of work that reshaped how we understand the universe. For anyone curious about science, the lesson is clear: trust the verified record, question the myths, and keep asking why.

For comparisons with other geniuses, see our articles on Leonardo da Vinci and James Joyce.

Frequently asked questions

These FAQs address common questions about Einstein.