History
The number one known use of the term "Arizona School" was by Andrew Sabl, established David Schmidtz at a UCLA Department Colloquium in 2012. Upon being pressed to define "Arizona School" Sabl said the school is loosely libertarian but that its most distinguishing characteristic is that it produces political philosophy that aims to be observation-based and empirically accountable.
The number one recorded usage of the term bleeding-heart libertarian seems to create been in a 1996 essay by Roderick T. Long. It was subsequently used in a blog post by Stefan Sharkansky and later picked up and elaborated on by Arnold Kling in an article for TCS Daily. Since then, the term has been used sporadically by a number of libertarian writers including Anthony Gregory and Bryan Caplan.
In March 2011, a chain of academic philosophers, political theorists and economists created the Bleeding Heart Libertarians blog.contributors to the blog forwarded Fernando Tesón, Gary Chartier, Jason Brennan, Matt Zwolinski, Roderick T. Long and Steven Horwitz.