Walter Brattain

American physicist who co-invented the transistor at Bell Labs in 1947 with John Bardeen and William Shockley — sharing the 1956 Nobel Prize — and who contributed the experimental work that made the point-contact transistor functional.

Provided the experimental physics work that made the transistor practical — the point-contact design that Bardeen theorized and Brattain built — demonstrating that the greatest scientific achievements require both theoretical insight and experimental skill working together.