Peter Mark Roget

Born in London on January 18, 1779, Peter Mark Roget studied medicine at the University of Edinburgh and went on to build a wide-ranging career as a doctor and writer. Alongside his medical work, he developed a reputation for careful thinking and an unusual talent for sorting complex subjects into clear systems.

He is remembered above all for Roget’s Thesaurus, first published in 1852. Instead of listing words alphabetically like a dictionary, Roget grouped them by meaning, creating a new kind of reference book that helped generations of readers and writers find exactly the right word.

Roget’s interests reached far beyond language. He wrote on science and medicine, worked with major learned societies, and served for many years as secretary of the Royal Society. He died in 1869, but his name remains closely tied to one of the most enduring and useful books in the English language.