linguist, linguistic scientist - a specialist in linguistics

Aristarchus - an ancient Greek grammarian remembered for his commentary on the Iliad and Odyssey (circa 217-145 BC)

Aelius Donatus, Donatus - Roman grammarian whose textbook on Latin grammar was used throughout the Middle Ages (fourth century)

Panini - Indian grammarian whose grammatical rules for Sanskrit are the first known example of descriptive linguistics (circa 400 BC)