David D. Friedman is an academic economist with a doctorate in physics, retired from 23 years of teaching in a law school. His first book, The Machinery of Freedom: Guide to a Radical Capitalism, was published in 1973 and includes a description of how a society with property rights and without government might function. There, as elsewhere, he offers a consequentialist defense of libertarianism.
His most recent non-fiction book is Legal Systems Very Different from Ours, covering systems from Periclean Athens through modern Amish and Romany. He is also the author of three novels, one commercially published and two self-published, and, with his wife, a self-published medieval and renaissance cookbook and a larger self-published book related to their hobby of historical recreation.
His latest work is available at https://daviddfriedman.substack.com/