Claude Shannon

Claude Shannon (1916–2001) is the father of the information age — the man who taught us that information is a thing you can measure, in bits. Before Shannon, nobody had a precise answer to "how much information is in this message?" After him, the whole modern world of phones, storage, streaming and the internet had its foundations.

Two revolutions, one lifetime

As a 21-year-old student, Shannon wrote what's often called the most important master's thesis ever: he noticed that Boole's logical algebra could be built from electrical switches — the blueprint for every digital circuit. Then, in 1948, he founded information theory from scratch: he defined the bit, proved how far any message can be compressed, and showed you can send data perfectly over a noisy channel — the reason a scratched disc or a weak phone signal can still come through flawless. His sampling theorem (with Nyquist) is why digital sound works, and his notion of entropy underlies how we measure a language model's perplexity today.

The juggling, unicycling genius

Shannon did serious science with an irrepressibly playful streak. He rode a unicycle down the halls of Bell Labs while juggling, built a mechanical mouse ("Theseus") that could learn a maze, made a machine whose only function was to switch itself off, and even wrote a paper on the mathematics of juggling. He treated the deepest ideas in science as a kind of joyful tinkering — and in doing so quietly invented the digital world you're reading this in.