just about every Austrian economist who's of age -- and they make up I'd say a large majority of the anarcho-capitalists -- knew or met Murray Rothbard. I believe just about everyone at the Ludwig von Mises Institute knew the guy.
It's really too bad he died at 69 of heart-attack. He could have lived another good 30 years. In general, free market economists tend to live to very old age (see von Mises and von Hayek, who both lived into their 90s). I wish I knew of the LvMI back before 1995, when Murray Rothbard was still alive!