Hugo Sinzheimer (1875-1945) is well known as one of the founding fathers of labour law. He favoured an interdisciplinary approach, combining legal-positivistic with sociological analysis. His work still has a significant relevance, in particular in the field of collective labour law. His ideas have had a large impact on collective labour law in European as well as in other countries, for instance Japan. Making his work accessible to researchers, and to others interested in his publications is the main goal of this website. We also propose an evaluation of the importance of his ideas, then as well as now. It includes a concise biography, a complete list of his publications, and references to literature and websites on Sinzheimer and his work.