Murray N. Rothbard
An economist of the Austrian school, founder of the Libertarian
movement, and prolific writer
. Influenced heavily by Ludwig von Mises
and F. A. Hayek
Rothbard's essays cover a wide range of topics, many of which are outside the realm of pure economics, including egalitarianism, the nature of a state, and the perils of socialism, fascism, and scientism.
I highly recommend Egalitarianism as a Revolt Against Nature, a collection of his essays.