Stephen Hawking

Stephen William Hawking (1942–2018) was a British theoretical physicist whose discoveries in gravitational physics and black hole thermodynamics—particularly his 1974 prediction that black holes emit thermal radiation due to quantum effects near the event horizon ("Hawking radiation")—fundamentally altered understanding of black hole physics, quantum field theory in curved spacetime, and the deep connections between thermodynamics and gravity. Born in Oxford, England, he studied physics at University College, Oxford (1959–1962) and pursued graduate research at Trinity College, Cambridge (1962–1966) under Dennis Sciama, specializing in relativistic cosmology and gravitational collapse. His early work demonstrated using geodesic completeness theorems that singularities form inevitably in gravitationally collapsed systems (in collaboration with Roger Penrose, 1965–1970)—providing rigorous mathematical support for the existence of spacetime singularities within black holes. His revolutionary 1974 calculation—applying quantum field theory in the curved spacetime background of a black hole—revealed that black holes possess a temperature proportional to κ/2π (where κ is the surface gravity), implying that black holes emit particles (now called Hawking radiation) with a thermal spectrum and possess entropy proportional to their event horizon's surface area (S = Ac⁴/4Għ, where A is the horizon area). This discovery demonstrated an intimate connection between black hole thermodynamics and statistical mechanics and suggested that quantum gravity effects fundamentally alter our understanding of black hole evaporation and information conservation. Despite being diagnosed with amyotrophic lateral sclerosis (ALS) at age twenty-one in 1963, a condition that progressively paralyzed him throughout his life, he continued his theoretical work and became an influential public intellectual through his 1988 bestseller A Brief History of Time (over ten million copies sold worldwide), communicating contemporary cosmology and quantum gravity to global audiences. His 2014 statement that "there is no event horizon"—modifying earlier black hole models to address the information paradox—demonstrated his continued engagement with fundamental theoretical challenges until his death in 2018.