Bohuslav Havránek (1893–1978) was a key figure in the Prague Linguistic Circle in the early 20th century. He worked on various projects related to the Czech language, such as dictionaries, grammars, and handbooks. Havránek's contributions helped improve our understanding of Czech dialects, the differences between written and spoken Czech, and the rules of Czech spelling. His work left a lasting impact on the study and preservation of the Czech language.