The Copenhagen School, officially the Linguistic Circle of Copenhagen (French: Cercle Linguistique de Copenhague), is a group of scholars dedicated to the study of linguistics. It was founded by Louis Hjelmslev (1899–1965) and Viggo Brøndal (1887–1942). In the mid twentieth century the Copenhagen school was one of the most important centres of linguistic structuralism together with the Geneva School and the Prague School. In the late 20th and early 21st century the Copenhagen school has turned from a purely structural approach to linguistics to a functionalist one, Danish functional grammar, which nonetheless incorporates many insights from the founders.