passionary
1. one inspired passionately through vision and compassion to change the world for the better: passionate visionary in action; 2. social entrepreneur emboldened to make a difference, volunteering above and beyond responsibiliity to family and work: an inspirational difference-maker. 3. society's agent of change: pioneer of benevolent innovation giving forward and causing positive ripples.
It takes a passionary like Millard Fuller who founded Habitat for Humanity, to change our world. These heroes are the problem solvers of the social issues we face in our country and around the world. Passionaries start or help build nonprofits which tackle dreams to help humanity, and their efforts ripple out.