American economist, columnist, and blogger. Professor at George Mason University, holding the Holbert L. Harris chair in the economics department. Co-host of the economics blog Marginal Revolution and co-founder of Marginal Revolution University.

Wonder, blunder, salve, solve! Working on tools that expand what people can think and do. Past: led R&D @KhanAcademy; helped build iOS @Apple.

I tweet mostly about great books and ideas. Retoolin' at @retool. Also: @tommyinhebrew