The innovative and revolutionary scholarship of the eminent Austrian legal theorist and professor of Roman law, Eugen Ehrlich (1862-1922), is of a very high caliber. His work has not only held its place well in view of what legal theory, especially sociological legal theory, has to offer, but is also still a powerful challenge to positions in legal theory that are no longer defensible. The sociology of law has followed in a direct line of succession from Ehrlich's observations and ideas as a new and special discipline linking jurisprudence with sociology.