Ron Avi Astor is the Stein-Wood Professor of School Behavioral Health in the USC Suzanne Dworak-Peck School of Social Work and USC Rossier School of Education (by courtesy). His work examines the role of the physical, social-organizational and cultural contexts in schools related to different kinds of bullying and school violence (e.g., sexual harassment, cyber bullying, discrimination hate acts, school fights, emotional abuse, weapon use, teacher/child violence). This work documents the ecological influences of the family, community, school and culture on different forms of bullying and school violence. This work has been used in Chile, Kosovo, France, California, and with military connected public schools. Astor's studies have included tens of thousands of schools and millions of students, teachers, parents and administrators. Over the past 20 years, findings from these studies have been published in more than 200 scholarly manuscripts. Along with his colleague Rami Benbenishty, Astor has developed a school mapping and monitoring procedure that can be used "at scale" regionally and with local students and teachers to generate "grassroots" solutions to safety problems. The findings of these studies have been widely cited in the international media, in the United States, and Israel. He is the author of "Welcoming Practices."