author
Robert Record
d. 1558
Best remembered for introducing the equals sign, this Welsh scholar helped make mathematics easier to read and teach in English. He wrote some of the first popular math books in the language, blending practical learning with a lively style.
1 Audiobook
About the author
Born in Tenby, Wales, around 1510, Robert Recorde was a physician, mathematician, and teacher who studied at Oxford and later also trained in medicine at Cambridge. He moved between science, medicine, and public service, showing the broad learning that marked many Renaissance scholars.
Recorde is most famous for introducing the equals sign in The Whetstone of Witte in 1557, choosing it because, as he explained, no two things could be more equal than a pair of parallel lines. He also wrote influential textbooks including The Grounde of Artes, helping bring arithmetic and algebra to English readers at a time when much technical learning was still shared in Latin.
His career also included work connected to the royal mints and the surveying of mines, but it ended unhappily after a legal dispute that led to imprisonment for debt. He died in 1558, yet his mark on everyday mathematics has lasted for centuries.