Thinker

Thomas Kuhn

He gave the world the phrase paradigm shift, then spent decades regretting how people used it.

Historian and philosopher of science, 1922-1996

Thomas Samuel Kuhn was born in Cincinnati, Ohio, in 1922 and studied physics at Harvard, earning his doctorate in 1949.1 He might have remained a physicist had he not been asked, in the summer of 1947, to deliver a lecture series on the origins of Newtonian mechanics. Preparing those lectures forced him to read Aristotle's physics, and he could not make sense of it.

The problem was not that Aristotle was wrong. The problem was that Kuhn was reading Aristotle through the lens of Newton, a framework so deeply assumed that it was invisible.2 Once Kuhn recognized the lens, Aristotle's ideas became coherent within their own system. That recognition reoriented his career from physics to the history and philosophy of science.

In 1962, the University of Chicago Press published The Structure of Scientific Revolutions, first as a monograph in the International Encyclopedia of Unified Science.3 Kuhn argued that science does not advance by the steady accumulation of facts. It operates within paradigms, shared frameworks of assumptions and methods, that define what counts as a legitimate question and a valid answer. When anomalies accumulate beyond what the paradigm can absorb, a crisis emerges, and a new paradigm replaces the old one in what Kuhn called a scientific revolution.

The book became one of the most cited academic works of the twentieth century.1

Kuhn taught at Berkeley, Princeton, and MIT over a career spanning four decades.1 At Berkeley, the day before the physicist Niels Bohr died, Kuhn was interviewing him on tape for the Sources for the History of Quantum Physics project.4

The phrase paradigm shift entered common language so rapidly that Kuhn found himself uncomfortable with its migration into business, politics, and popular culture. He attempted to replace paradigm with the narrower term exemplar, with little success.5

In a 1965 symposium at Bedford College, London, chaired by Karl Popper, several leading philosophers attacked Kuhn's arguments. Kuhn later said the critics' readings of his book were so inconsistent with his own understanding that he was tempted to posit the existence of two Thomas Kuhns.3 He died of cancer at his home in Cambridge, Massachusetts, on June 17, 1996, at the age of seventy-three.4

Timeline

1947

Kuhn's attempt to read Aristotle through Newton's framework triggers his career shift.

1962

University of Chicago Press publishes The Structure of Scientific Revolutions.

1965

Bedford College symposium, chaired by Karl Popper, subjects Kuhn to sustained criticism.

1996

Kuhn dies at seventy-three in Cambridge, Massachusetts.

Endnotes

1 Encyclopaedia Britannica, "Thomas S. Kuhn," last updated February 18, 2026.

2 Thomas S. Kuhn, The Essential Tension: Selected Studies in Scientific Tradition and Change (Chicago: University of Chicago Press, 1977), xii.

3 Thomas S. Kuhn, The Structure of Scientific Revolutions (Chicago: University of Chicago Press, 1962; 2nd ed. with postscript, 1970).

4 MIT News Office, "Prof. Thomas S. Kuhn of MIT, Noted Historian of Science, Dead at 73," June 1996.

5 Thomas S. Kuhn, The Structure of Scientific Revolutions, 2nd ed. (1970), postscript.