David Wessel, Director of the Hutchins Center at the Brookings Institution, wrote a brief clip about him for the list:
If the right is to have a shot at steering American public policy, Arthur Brooks will be one of the architects of its vision. Hi conservatism stands for something more than tax cuts for the rich and ever-tighter restrictions on abortions. The New York Times' David Brooks described it as "capitalism for the masses": It includes a heavy emphasis on social entrepreneurship - leveraging business techniques to solve social problems. Not what you'd expect from a Seattle-born French-horn player.
An full biography of Arthur Brooks can be found here.