Tyler Cowen occupies the Holbert C. Harris Chair of economics as a professor at George Mason University and is co-author of the popular economics blog Marginal Revolution. He currently writes the Economic Scene column for the New York Times and writes for such magazines as The New Republic and The Wilson Quarterly. Cowen is also general director of the Mercatus Center at George Mason University.

About TEDx, x=independently organize event
In the spirit of ideas worth spreading, TEDx is a program of local, self-
organized events that bring people together to share a TED-like experience.
At a TEDx event, TEDTalks video and live speakers combine to spark deep
discussion and connection in a small group. These local, self-organized
events are branded TEDx, where x=independently organized TED event.
The TED Conference provides general guidance for the TEDx program, but
individual TEDx events are self-organized.*
(*Subject to certain rules and regulations)

(From Youtube)