Richard Feynman

The clips that circulate tend to be about explaining things — the insistence that if you cannot make an idea intelligible, you may not understand it yet. That was the working principle of a theoretical physicist and teacher whose reputation rests as much on how he thought as on what he proved. Clarity was not a presentational afterthought for him; it functioned as a test of the work itself.

He was born in New York City in 1918. His early work showed a willingness to question assumptions he had inherited rather than accept them, and a knack for reframing problems into forms that could actually be handled. He built his methods out of reading, travel and correspondence, and out of apprenticeships and collaborations that left him with a settled craft ethos. What stood out in his first results was not their novelty so much as how sharply they were stated.

Mid-career brought consolidation and a wider range of problems. Rivals and critics pushed him, and the pressure sharpened both the arguments and the way he set them out. Lectures, publications and demonstrations turned tentative ideas into settled statements. He moved between analysis and construction, theory and experiment, and treated failures as tests that told him something useful. Students and interlocutors carried the approach outward, well beyond any single institution, and his work became a reference point across disciplines.

Later he turned to systematisation: notes, editions and reflective essays aimed at fixing the best form of the central insights. The archives keep the drafts and corrections alongside the finished prose, which is part of why they remain useful. He died in 1988. Path integrals and a pedagogy of curiosity serve as shorthand for what he left behind — a method that gets reenacted in classrooms and laboratories rather than simply cited.