Dr Williamson founded the International Human Trafficking and Social Justice Conference in 2004 to bring together researchers, practitioners, and individuals with lived experience in an effort to lay the groundwork for future collaborative research, advocacy, and program development.

To date, the trafficking conference has welcomed attendees from 42 states and 30 countries to learn from researchers, survivors, and social service, health care, and criminal justice professionals about human trafficking and social justice topics. It now serves as the oldest and largest academic conference on human trafficking in the world.