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One in four college women have survived rape or attempted rape.

Statistics can change. Everyone can help.



One in Four announces the creation of the Mary P. Koss Profile in Courage Award

Dr. Mary Koss (http://publichealth.arizona.edu/directory/Mary-Koss), a Regents Professor of Health Promotion at the University of Arizona, is the author of the original "One in Four" study released in 1987. This study established the prevalence of rape on college campuses, having since been replicated for 25 years.

While many people challenged Dr. Koss personally and professionally, she responded by sticking to the data and publishing more research. Her courage and tenacity serves as a role model for researchers and victim advocates alike. We all owe a debt of gratitude for her leadership in the movement to end sexual violence. Every year we at One in Four will choose one individual or group who best personifies the courage and commitment to justice that Dr. Koss has and continues to show us all. Thank you, Dr. Mary Koss, for making a difference!

(Click here for press release)

One in Four college women have survived rape or attempted rape in their lifetime.


One in four women in the military experience rape or attempted rape during their military service.


Research shows that The Men's Program leads to a 40% decline in sexual assault behavior (and much more).


Research shows that The Women's Program leads to increased bystander intervention (and more).


Explore our website to learn how we can help you end rape on your campus, on your military base, and in your community.













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