"Block is also a Senior Faculty member of the Ludwig von Mises Institute for Austrian Economics. His most famous work is Defending the Undefendable, of which John Stossel said, "Defending the Undefendable... opened my eyes to the beauties of libertarianism. It explains that so much of what is assumed to be evil--is not." Lew Rockwell of the Mises Institute said this about Walter Block's active role in modern libertarianism:Murray Rothbard, in his life, was known as Mr. Libertarian. We can make a solid case that the title now belongs to Walter Block, a student of Rothbard's whose own vita is as thick as a big-city phonebook, and as diverse as Wikipedia.