Charlton Grant Laird (1901–1984) was an American linguist, lexicographer, novelist, and essayist. Laird created the 1971 edition of the Webster's New World Thesaurus that became the standardized edition still used today. During his lifetime, he was probably best known for his language studies: books, textbooks, and reference works elucidating the English language for the layman along with his numerous contributions to dictionaries and thesauruses.
Source: Wikipedia