As president and CEO of Pax World Management and the Pax World Funds sustainable investment platform, Joseph Keefe provides an opportunity for thousands of investors to put their money where their values are, to the tune of more than $3 billion globally. Keefe recently spoke with Ensia and Forbes about the what and why of sustainable investing and his conviction that it’s not only the right thing to do, but also the smart thing to do — from the perspective of performance as well as principle.