Henri has worked for numerous NGOs and research institutions on gender, peace and security, focusing mostly on Southeast Asia and Central Asia, but also on Sub-Saharan Africa, the Middle East and Central and Eastern Europe. He holds a PhD in Conflict Resolution and Peace Studies and wrote his thesis on masculinities and urban violence in Timor-Leste. He has worked on gender-based violence prevention, on critically engaging masculinities, integrating diverse sexual orientation and gender identity and expression (SOGIE) perspectives into peace and security work, as well as the gender dimension of small arms and light weapons, armed conflict and formal and informal security sector actors.