For a 22-year-old Columbia University student, Joel Davis had built an impressive reputation as an activist for ending sexual violence. He was the founding executive director of the international organization Youth to End Sexual Violence [and] served as a youth ambassador for the United Nations special representative on sexual violence in conflict. Davis traveled around the world, worked alongside high-profile activists such as Angelina Jolie, delivered a TED talk and appeared on media panels. Yet behind this virtuous front, Davis was allegedly committing the same types of crimes he claimed to be fighting, federal prosecutors say. On Tuesday, authorities arrested Davis on charges of attempting to sexually exploit a child, enticing a child to engage in sexual activity and possessing child pornography. Over the course of several weeks ... prosecutors say, Davis exchanged text messages with undercover FBI agents, trying to arrange meetings with a 9-year-old girl, an 8-year-old girl and a 2-year-old boy. Davis allegedly sent the undercover agents sexually explicit photos and videos of children as young as infants and made clear that he wanted to have sex with children of any age, according to a federal criminal complaint. He also admitted to meeting a 13-year-old boy on the dating app Grindr, speaking with him on Snapchat and engaging in sexual activity with the boy at Davis's Manhattan apartment