Grimm, Jakob Ludwig Karl 1785-1863. German philologist and folklorist who formulated Grimm's Law (1819), the cornerstone for most of modern-day comparative linguistics. With his cousin Wilhelm Karl (1786-1859) he accumulated Germanic folk stories and published them as Grimm's Fairy stories (1812-1815).
the older associated with the two Grimm brothers remembered best for their fairy stories; in addition writer of Grimm's law describing consonant alterations in Germanic languages (1785-1863)
the younger of two Grimm brothers remembered perfect for their particular fairy tales (1786-1859)