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Stephen Hawking (1942–2018) was a renowned British theoretical physicist and cosmologist, famous for his work on black holes, Hawking radiation, and his best-selling book 'A Brief History of Time.' Despite being diagnosed with ALS at age 21, he became one of the most influential scientists of his era. More Less
Jan 8, 1942
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Stephen William Hawking was born in Oxford, England, on the 300th anniversary of the death of Galileo Galilei. His parents, Frank and Isobel Hawking, had moved to Oxford from London to escape wartime bombing during World War II.
Image source: Stephen Hawking
Sep 1, 1950 - 1959
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Hawking attended St Albans School in Hertfordshire after his family moved to nearby St Albans. Though initially a middling student academically, he developed a keen interest in science and earned the nickname 'Einstein' among classmates.
Oct 1, 1959 - 1962
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At age 17, Hawking began studying physics and chemistry at University College, Oxford. Despite finding much of the coursework unchallenging, he graduated with first-class honours in natural sciences in 1962.
Image source: University College, Oxford
Oct 1, 1962
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Hawking moved to the University of Cambridge to pursue doctoral research in cosmology at Trinity Hall under the supervision of Dennis Sciama, turning his attention to the study of the early universe and general relativity.
Image source: Trinity Hall, Cambridge
Jan 1, 1963
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At just 21 years old, Hawking was diagnosed with amyotrophic lateral sclerosis, a degenerative motor neurone disease, and was given roughly two years to live. He defied this prognosis for over five decades, continuing his scientific work as the disease gradually paralysed him.
Image source: ALS
Jan 1, 1965
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Hawking became a Research Fellow at Gonville & Caius College, Cambridge, where he would remain affiliated for the rest of his life, rising through the academic ranks over the following decades.
Image source: Gonville and Caius College, Cambridge
Jul 14, 1965
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Hawking married Jane Wilde, a modern languages student he had met shortly before his diagnosis. Their marriage gave him renewed motivation and support as his health declined; the couple later had three children: Robert, Lucy, and Timothy.
Jan 1, 1985
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During a visit to Geneva, Hawking contracted pneumonia and underwent a lifesaving tracheotomy that permanently removed his natural speech. He subsequently communicated using a speech-generating device operated via a cheek muscle, retaining his distinctive robotic American accent.
Image source: Tracheotomy
Jan 1, 1990
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After twenty-five years of marriage, Hawking and Jane Wilde divorced. The strains of his illness and growing fame had placed heavy pressure on their relationship. Hawking later married his nurse Elaine Mason in 1995; they divorced in 2006.
Jan 1, 1965 - Mar 1, 1966
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Hawking completed his doctoral thesis, 'Properties of Expanding Universes,' which applied general relativity to cosmology and argued that the universe could be understood through singularity theorems. He received his PhD in March 1966.
Image source: Stephen Hawking
Jan 1, 1965 - 1970
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Working with Roger Penrose, Hawking developed a series of mathematical theorems demonstrating that singularities are a generic feature of general relativity. Applied to cosmology, this implied that the universe began with a spacetime singularity — the Big Bang.
Jan 1, 1974
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Hawking made his most famous theoretical discovery: applying quantum field theory to curved spacetime near black hole event horizons showed that black holes should emit thermal radiation. This insight linked gravity, quantum mechanics, and thermodynamics in a revolutionary way.
Image source: Hawking radiation
1983
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Together with physicist James Hartle, Hawking proposed the Hartle–Hawking state, describing the universe as having no boundary in imaginary time. This suggested that asking what came 'before' the Big Bang may be meaningless, offering a quantum description of the universe's origin without requiring a creator.
Image source: Hartle–Hawking proposal
Jul 21, 2004
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At a conference in Dublin, Hawking conceded a famous 1997 bet with Kip Thorne and John Preskill, admitting that information swallowed by black holes is not destroyed but eventually escapes, resolving the black hole information paradox in favor of quantum mechanics.
Image source: Black hole information paradox
Dec 1, 2014
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In interviews and public statements, Hawking warned that fully developed artificial intelligence 'could spell the end of the human race,' becoming one of the most prominent voices urging caution and research into AI safety.
Image source: Existential risk from artificial intelligence
Jul 20, 2015
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Hawking joined Russian billionaire Yuri Milner and other scientists in launching Breakthrough Listen, a $100 million project to search for extraterrestrial intelligence using some of the world's largest radio telescopes.
Image source: Breakthrough Listen
Jan 1, 1974 - 1974
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Following his election to the Royal Society, Hawking traveled to Washington D.C. where he met U.S. President Gerald Ford, and later visited the Vatican where Pope Paul VI commended his work on black holes.
Image source: Gerald Ford
Mar 1, 1974
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Hawking became one of the youngest scientists ever elected a Fellow of the Royal Society, one of Britain's highest scientific honours, in recognition of his groundbreaking work on black holes and singularities.
Image source: Fellow of the Royal Society
Jan 1, 1979 - 2009
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Hawking was appointed Lucasian Professor of Mathematics at the University of Cambridge, a chair once held by Isaac Newton. He held the position for thirty years until retiring in 2009.
Aug 12, 2009
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U.S. President Barack Obama awarded Hawking the Presidential Medal of Freedom, America's highest civilian honour, recognizing his lifetime of scientific achievement and his role as an inspiration to people around the world.
Image source: Presidential Medal of Freedom
Oct 1, 2009
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Reaching Cambridge's mandatory retirement age, Hawking stepped down from the Lucasian Professorship after three decades. He then took up the post of Director of Research at the Centre for Theoretical Cosmology.
Image source: Lucasian Professor of Mathematics
Mar 14, 2018
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Hawking died peacefully at his home in Cambridge on Pi Day and the 139th anniversary of Einstein's birth. Tributes poured in from around the world celebrating his extraordinary contributions to physics and his remarkable resilience in living more than fifty years beyond his ALS prognosis.
Apr 1, 1988
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Hawking's landmark popular science book explained cosmology, black holes, and the nature of time for general readers. It became an international bestseller, remaining on the London Sunday Times bestseller list for more than four years and selling millions of copies worldwide.
Image source: A Brief History of Time
Jan 1, 1993
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This collection of essays and lectures explored black holes, quantum mechanics, and personal reflections on living with ALS, further cementing Hawking's reputation as one of the most accessible communicators of complex physics.
Image source: Black Holes and Baby Universes and Other Essays
Jan 1, 1996
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Hawking released an illustrated edition of A Brief History of Time, updating the text and adding hundreds of illustrations to help readers visualize concepts like spacetime curvature and black holes.
Nov 6, 2001
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This sequel to A Brief History of Time presented developments in theoretical physics including superstrings, p-branes, and imaginary time. It became another bestseller, winning awards for its richly illustrated presentation of advanced cosmology.
Image source: The Universe in a Nutshell
Jan 1, 2005
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Hawking edited and published this anthology featuring excerpts from landmark works by history's greatest mathematicians, from Euclid and Newton to Alan Turing, accompanied by his own commentary on each thinker's contributions.
Image source: God Created the Integers
Sep 27, 2005
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Co-authored with physicist Leonard Mlodinow, this streamlined rewrite of A Brief History of Time simplified explanations and added new material on topics like string theory, making the content even more accessible to lay readers.
Jan 1, 2007 - 2014
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Co-written with his daughter Lucy Hawking, the George series introduced young readers to astronomy and physics through adventure stories, beginning with George's Secret Key to the Universe in 2007 and followed by several sequels.
Image source: George's Secret Key to the Universe
Oct 16, 2018
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Published posthumously, this collection of essays compiled Hawking's answers to ten fundamental questions, from the existence of God to the future of humanity, drawing on his final writings and unfinished work.
Image source: Brief Answers to the Big Questions
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