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.