F. B. J. Kuiper

Franciscus Bernardus Jacobus "Frans" Kuiper (/ˈkaɪpər/ ^ⓘ KY-pər; Dutch: [ˈkœypər] ^ⓘ; 7 July 1907 – 14 November 2003) was a Dutch linguist and Indologist. Between 1939 and 1972, he was professor of Sanskrit at Leiden University. He served as chair of the Balto-Slavic languages, taking on the role in 1941. His research focused largely on Sanskrit, historical linguistics, and historical Indian mythology, though he contributed significantly to research of laryngeal theory and the Munda languages as well.

Kuiper's most notable contributions concerned reflexes of the nasal present in Sanskrit inherited from its Proto-Indo-European ancestor, the declension systems of Proto-Indo-European which validated an earlier theory proposed by Holger Pedersen, and the influence of Paleo-European substrates on the Indo-European languages. His analysis of vowel length in Sanskrit led to the discovery of a more widespread process now known as Kuiper's law.

Through his service in the Royal Netherlands Army's military reserve as an artillery officer, Kuiper was able to fund his graduate education. As a condition of his scholarship, he served a stint as a classics teacher at the lyceum in Batavia in the Dutch East Indies (modern-day Jakarta, Indonesia) until he was appointed to the professorship in Leiden. Kuiper served in the Netherlands' reserve component until 1948. In 1957, he co-founded the academic journal Indo-Iranian Journal with his former student J. W. de Jong and served as its editor-in-chief until 1979, though he remained a part of the editorial process until at least the 1990s. Along with Jan Gonda, Kuiper has been credited with helping improve the standing of Dutch Indology internationally. With his mentors Nicolaas van Wijk and C. C. Uhlenbeck, Kuiper has been credited with helping shape Leiden University as a premier institution for Indo-European linguistics.