For all his star power, though, Damon is more than just the pretty face of Water.org. He has turned himself into a development expert. This would seem like an obvious and necessary first step for someone embracing the global water crisis as a personal mission. But, in fact, it’s highly unusual for a celebrity to dive this deep into a problem this daunting. Whether talking microfinance strategy with rural bankers, giving detailed reports from the field at the annual Clinton Global Initiative, or personally thanking donors like PepsiCo CEO Indra Nooyi, Damon has quietly developed the cred of a program geek.