The cousin of Ludwig Wittgenstein, his book The Constitution of Liberty included the misleadingly titled postscript "Why I am not a conservative," but this Austrian is best known for attacking Keynesian economics.  
He discussed theoretical psychology in The Sensory Order and attacked the idea that social scientists should adopt the methods of physical science in The Counter-Revolution of Science.  The cousin of Ludwig Wittgenstein, his book The Constitution of Liberty included the misleadingly titled postscript "Why I am not a conservative," but this Austrian is best known for attacking Keynesian economics.  For 10 points-name this economist who shared the Nobel Prize with Gunnar Myrdal, the author of The Road to Serfdom.
He discussed theoretical psychology in The Sensory Order and attacked the idea that social scientists should adopt the methods of physical science in The Counter-Revolution of Science.  
Friedrich Hayek