Peter Mark Roget, best remembered as the person who compiled Roget’s Thesaurus. He was a physician by trade, but was actually pretty slow to start up that career, taking multiple detours along the way. Biographers noted that he suffered from depression most of his life, and, from an early age, compiled lists as a relaxation mechanism. After he retired as a physician, he earnestly compiled lists and lists of meanings of words and phrases, and indexed and organized them so that they could be referenced.