Dr. Zachary Kwena is the Director of Research and Evidence at Usawa Agenda. Previously, he was Senior Social Scientist at KEMRI for 20 years, leading NIH-funded research on HIV prevention and behaviour change. He specialised in designing formative qualitative studies and randomised controlled trials using human-centred approaches to influence behaviour change, especially among vulnerable populations. He has won several recognitions and awards, including the KEMRI International Recognition Award, the KEMRI Top 20 Principal Investigators Award, and the IAS Women, Girls and HIV Investigator’s Prize. Dr. Kwena’s research has had a significant impact in informing policy and scaling up interventions in Kenya. At Usawa Agenda, his responsibilities include research and evaluation designs, fundraising through grant applications, overseeing research implementations, and dissemination of findings through journal publications and conferences.