FAIRFAX, Va., May 12 -- George Mason University issued the following news release:

When George Mason University senior Avery Butler was 16 years old, his family traveled to Cambodia to visit the Killing Fields, the massacre sites associated with the country's brutal Khmer Rouge era. The experience would change Butler's perspective on life and inspire him to pursue a professional career in peacebuilding.

"I walked in and came face-to-face with a giant wall of human skulls," said Butler, who is graduating with a bachelor's degree in conflict analysis and resolution in May. "It was such a jarring moment, and I asked myself how human beings could do this to one another and how we could prevent something like this from ...