Albumen print Private collection of Noel Chanan Peter Mark Roget FRS (January 18, 1779 - September 12, 1869) was a British physician, natural theologian and lexicographer. He is best known for publishing, in 1852, the Thesaurus of English Words and Phrases (Roget's Thesaurus), a classified collection of related words. (http://en.wikipedia.org/wiki/Peter_Mark_Roget, accessed: 7th Sept 2009)