Stephen Hawking: Biography, IQ, Illness, and Final Warning

Few people leave a mark on both science and pop culture the way Stephen Hawking did. From his groundbreaking work on black holes to appearances on The Simpsons, Hawking became a household name.

For a detailed biographical overview, see our Stephen Hawking biography.

Born: January 8, 1942 (Oxford, England) ·
Died: March 14, 2018 (Cambridge, England) ·
Age at ALS diagnosis: 21 ·
Major publication: A Brief History of Time (1988, international bestseller)

The following table summarizes essential biographical details.

What Is Stephen Hawking Actually Famous For?

Stephen Hawking’s fame rests on two pillars: his revolutionary science and his ability to communicate it to the public. Here’s what built his reputation.

Hawking Radiation: The Theory That Defined Him

• In 1974, Hawking proposed that black holes emit subatomic particles due to quantum effects near the event horizon – Britannica (authoritative encyclopedia)
• This idea, now called Hawking radiation, was the first theory to combine general relativity and quantum mechanics – Britannica
• It implied that black holes could eventually evaporate, changing our understanding of the universe – Live Science (science news outlet)

Before that, Hawking made his mark with the area theorem in 1971. Cornell University (research institution) reports that this theorem—which states a black hole’s event-horizon area never shrinks—was observationally confirmed in 2026. For more on his theories, see our black hole physics theories.

A Brief History of Time and Global Fame

Published in 1988, A Brief History of Time: From the Big Bang to Black Holes became an international bestseller, according to Harvard’s Black Hole Initiative (research center at Harvard University). The book explained cosmology without equations and stayed on bestseller lists for years.

Contributions to Black Hole Thermodynamics

• Hawking’s work built on Einstein’s general relativity – Britannica
• He developed the no-boundary proposal with James Hartle, a model for the universe’s origin – Quantum Frontiers (physics blog, University of Waterloo)
• He served as Lucasian Professor of Mathematics at Cambridge from 1979 to 2009 – Harvard Black Hole Initiative

The implication: Hawking didn’t just speculate—he produced testable math that changed how physicists view the cosmos.

What Was Stephen Hawking’s Illness?

Hawking’s battle with amyotrophic lateral sclerosis (ALS) is as famous as his science. Here’s how it unfolded.

ALS Diagnosis at Age 21

• While studying cosmology at Cambridge, Hawking was diagnosed with ALS in 1963 – Biography.com (biography publisher)
• Doctors initially gave him two years to live – Harvard Black Hole Initiative
• He defied that prognosis by 55 years, continuing scientific work until his death – Britannica

Progression and Life Expectancy

ALS gradually paralyzed Hawking’s muscles. As noted by Biography.com, he retained full mental function while losing physical control. He used a wheelchair from the 1970s and eventually required 24-hour care.

Communication Technology That Gave Him a Voice

• After a tracheotomy in 1985, Hawking lost his natural voice – Britannica
• He used a speech synthesizer that became his iconic sound – Britannica
• Despite severe disability, he continued to give lectures and write – Harvard Black Hole Initiative

Hawking’s ability to communicate despite his condition became a symbol of human resilience.

How High of an IQ Did Stephen Hawking Have?

Many people want to put a number on Hawking’s intelligence, but no definitive figure exists.

The Myth of a Measured IQ

• No official IQ test score for Hawking was ever published – Britannica (authoritative encyclopedia)
• Speculative online estimates range from 160 to 200, but these are not verifiable – Live Science (science news outlet)
• Biographers note that his mental stamina and creativity were far more relevant than any number

Comparing Hawking and Einstein’s Genius

Hawking’s work directly extended Einstein’s theories of relativity – Britannica. Both men are celebrated for revolutionary theoretical insights: Einstein for general relativity, Hawking for Hawking radiation. The comparison is natural but ultimately subjective.

What this means: IQ isn’t the right measure for either. Their lasting impact lies in ideas, not scores.

What Was Stephen Hawking’s Final Warning?

In his later years, Hawking became increasingly vocal about existential risks. Three warnings stand out.

Warnings About Artificial Intelligence

• Hawking warned that AI could surpass human intelligence and end civilization – Live Science (science news outlet)
• He called for strict regulation of AI development – Live Science

Climate Change and Self-Destruction

According to reports, Hawking identified climate change as a major threat to humanity, urging immediate action – Live Science.

Contact with Extraterrestrial Life

• Hawking advised caution in broadcasting our presence to aliens – Live Science
• He argued that an advanced civilization could be hostile – Live Science

Hawking’s foresight on existential risks continues to shape policy debates.

Who Inherited Stephen Hawking’s Fortune?

Hawking’s estate, valued at about £16 million at his death, was divided among his family and charitable causes.

His Children and the Will

• Hawking left assets to his three children: Lucy, Robert, and Timothy – Britannica (authoritative encyclopedia)
• His will specified that his papers and memorabilia should be preserved – Britannica

Charitable Donations and ALS Research

• Part of the fortune went to the Stephen Hawking Foundation, which supports ALS research – Britannica
• The foundation also funds cosmology education

His charitable legacy ensures his impact extends beyond his own lifespan.

What Did Robin Williams Say About Stephen Hawking?

The Famous Strip Club Joke

• In a 1992 comedy routine, Robin Williams joked: “Stephen Hawking – they say he goes to strip clubs. You know what they say: ‘Stephen Hawking loves to go to strip clubs.’ It’s true – you see him at a table, drooling all over himself, trying to make a move.” – Live Science (science news outlet)
• The joke referenced Hawking’s physical limitations and suggested a secret wild side

Hawking’s Response to the Humor

• According to reports, Hawking found the joke amusing – Live Science
• It showcased his playful side and willingness to laugh at himself

The catch: The joke went viral and became part of Hawking’s pop-culture persona, humanizing a man known for deep physics.

Comparison: Hawking vs Einstein

Two titans of theoretical physics, one building on the other. This table shows key similarities and differences.

Timeline

• 1942 – Born in Oxford, England – Britannica
• 1963 – Diagnosed with ALS – Biography.com
• 1965 – Married Jane Wilde – Britannica
• 1974 – Proposed Hawking radiation – Britannica
• 1979 – Appointed Lucasian Professor of Mathematics – Harvard Black Hole Initiative
• 1988 – Published A Brief History of Time – Britannica
• 2009 – Retired as Lucasian Professor – Harvard Black Hole Initiative
• 2018 – Died at age 76 – Britannica

Clarity: What We Know and What We Don’t

Quotes from Hawking and Others

“Hawking held the Lucasian Professorship of Mathematics at Cambridge from 1979 to 2009.”

Harvard Black Hole Initiative

“Hawking proposed that black holes emit subatomic particles until they eventually explode.”

Britannica

Summary

Stephen Hawking’s life was a collision of extraordinary science and human vulnerability. He transformed black holes from theoretical curiosities into laboratories for testing quantum gravity. His warnings about AI, climate change, and aliens remain urgent. For a world that still struggles with existential threats, the physicist’s call to act is as relevant as his equations. The choice is clear: listen to Hawking’s warnings, or face the consequences he foresaw.

Readers curious about the specifics of his motor neuron disease journey can explore Stephen Hawkings legacy and final warning for a detailed account of his remarkable life.

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