This copy is for your personal, non-commercial use only. To order presentation-ready copies for distribution to your colleagues, clients or customers visit http://www.djreprints.com. The financial industry has jumped on the impact investing and environmental, social or governance—or ESG—bandwagon. But Hiromichi Mizuno, the man who oversees $1.6 trillion in the world’s largest public pension fund, says true believers on Wall Street are still hard to find, so he is taking his own steps to push ESG and impact investing off the sidelines.