Jared Genser is an associate of the Carr Center for Human Rights Policy at Harvard University. This article was first published in the Washington Post on April 24, 2015. Three years ago, President Obama created the Atrocities Prevention Board to help fulfill his important recognition that the prevention of mass atrocities is a “core national security interest and core moral responsibility.” With ethnic conflict boiling in Burma, South Sudan and the Democratic Republic of the Congo, among other places, such a mechanism has never been more important. Although the board’s operations have been classified, there have been some visible successes. But much remains to be done.