Global philanthropy is a fast-changing field. In the United States, a new generation of donors are launching foundations and taking the reins at established institutions. In emerging markets, rising billionaires are using their wealth to address entrenched development challenges. Using the social technologies of a connected world, philanthropists are tapping new sources of capital and even reversing the flow of aid into developed economies. In this edition of Voices, distinguished experts and donors share new insights on global giving trends and propose solutions to barriers that inhibit individual philanthropy aimed at improving social outcomes.