Social Impact Exchange's 2018 conference focuses on how philanthropy can help lead an era of cross-sector collaboration. SIE has lined up an exciting roster of keynotes and session speakers (including Cornerstone's Erika Karp) who will share why cross-sector collaboration is key to unlocking impact at scale and will offer their insights on how to get it done. The Social Impact Exchange is a national, cross-sector membership association whose primary goal is to form multi-sector collaborations to shift systems and scale effective interventions to improve the lives of millions.