John Maynard Keynes was born on 5 June 1883 in Cambridge, United Kingdom, to John Neville Keynes and Florence Ada Keynes. He became one of the most influential economic thinkers of the twentieth century. Educated at Eton and then at Cambridge University, he studied mathematics and later economics, becoming a fellow of King's College. In 1915, Keynes joined the British Treasury, contributing to wartime finance and later serving as an advisor during the Paris Peace Conference. His early criticism of the Treaty of Versailles was detailed in his influential book. In the 1930s, during the Great Depression, Keynes developed theories that revolutionized economic thought, advocating for government intervention to stabilize economies. These ideas were foundational to what became known as Keynesian economics. His contributions shaped both academic economics and global economic policy, particularly influencing post-World War II reconstruction. He married Lydia Lopokova in 1925 and remained active in public life until his death on 21 April 1946 at age 62. His legacy continues through those he influenced and the institutions he helped shape.