Patrick O’Leary is an internationally recognised researcher he has conducted numerous complex research projects in Australia, USA, UK, Afghanistan, China, Indonesia, Sri Lanka, Pakistan, Albania, Sudan, Nepal, and Lebanon for international clients including Terre des hommes, Islamic Relief Worldwide, and UNICEF. He has significant expertise in domestic violence/gender-based violence (with a focus on perpetrator intervention, integrated, differential, and intersectional responses), child protection, long-term impact of child sexual abuse (especially for men), social work, hope, and socially excluded young people. His work has focused on these issues in both high and low income countries. He has published in high quality social work and criminology journals including Child Abuse Neglect, Journal of Family Violence, Journal of Interpersonal Violence, and British Journal of Social Work. Professor O’Leary’s work has influenced international domestic violence and child protection policy and practice.