Jacob Grimm was a German philologist, linguist, and folklorist, born on January 4, 1785. He is best known for his work in collecting and publishing fairy tales, alongside his brother Wilhelm Grimm. Their collection, titled "Grimm's Fairy Tales," includes famous stories like "Cinderella" and "Hansel and Gretel." In addition to his contributions to folklore, Jacob Grimm made significant advancements in the study of language. He is recognized for formulating Grimm's Law, which describes the systematic phonetic changes in the Germanic languages. His work laid the foundation for modern linguistics and has had a lasting impact on the field.