Onen is a trained Social Anthropologist (SOAS, University of London), and Psychologist graduating from Kyambogo University in Uganda. His interest in the area of Gender & Sexuality, has for almost a decade lead to work in refugee project design and management, conflict-related sexual violence, working with refugee peer support groups and vulnerable communities, designing capacity building and mentorship programmes for multiple stakeholders and civil society actors, and facilitating high-level trainings. Onen is a strong advocate and speaker on issues related to refugees and conflict-related sexual violence, and a was co- founder of the South- South Institute on Sexual Violence Against Men and Boys (SSI) in 2012.