He is very difficult to categorize: he is a liberal Australian academic who is an admirer of both Keynes and Hayek, and has built upon and synthesized both of their work. He does a lot of computer simulations of economies using real-world behaviors (e.g. mark-up pricing) and has generated results and opinions that are guaranteed to annoy pretty much everyone.
He blogs at Forbes (which is funny, given his politics):
http://www.forbes.com/sites/stevekeen/
And has a great book out that takes on classical economics:
http://www.amazon.com/Debunking-Economics-Revised-Expanded-D...