David D. Friedman is Professor of Law at Santa Clara University, California. After receiving a Ph.D. in theoretical physics at the University of Chicago, he switched fields to economics and taught at Virginia Polytechnic University, the University of California at Irvine, the University of California at Los Angeles, Tulane University, the University of Chicago, and Santa Clara University. A professional interest in the economics of law led to positions at the law schools of the University of Chicago and Cornell and thereafter to his present position, where he developed the course on legal issues of the twenty-first century, which led to his writing Future Imperfect. Professor Friedman's first book, The Machinery of Freedom: Guide to a Radical Capitalism, was published in 1973, remains in print, and is considered a libertarian classic. He wrote Price Theory: An Intermediate Text (1986), Hidden Order: The Economics of Everyday Life (1996), and Law's Order: An Economic Account (2000). His first work of fiction, Harald, was published in 2006. Professor Friedman's scientific interest in the future is longstanding. The Cypherpunks, an online group responsible for much early thinking about the implications of encryption, included The Machinery of Freedom on their list of recommended readings. Professor Friedman's web page, http://www.davidfriedman.com, averages over 3,000 visitors a day and his blog, Ideas, at http://daviddfriedman.blogspot.com receives about 400 daily visits.