Otto Jespersen

Otto Jespersen was a Danish linguist known for his extensive work on English grammar and on general theories of language structure and change. His multi-volume work A Modern English Grammar on Historical Principles, published across the early twentieth century, was among the most thorough descriptive grammars of English produced up to that time, grounding grammatical description in the historical development of the language rather than treating rules as fixed. Jespersen also wrote influentially on phonetics and on language acquisition and change, arguing that languages tend to evolve toward greater structural efficiency over time. He additionally designed Novial, a constructed international auxiliary language intended to be easy to learn for speakers of major European languages, reflecting his broader interest in language as a practical human tool as well as an object of scientific study.