Dr Jonas holds a PhD in Public Health from Maastricht University. She is a Specialist Scientist in the Health Systems Research Unit at the South African Medical Research Council, where she leads the adolescent and youth sexual and reproductive health focal area. She has over 10 years working experience leading (as a PI/co-PI and project manager) several large cross-sectional household/school surveys, including implementation science studies. She is the PI of the impact evaluation project of a large donor-funded intervention: a non-randomized controlled trial- The HERStory 3 Study. She is an Associate Editor at the BMC’s Reproductive Health Journal. Her research specialty is mainly on access and use of SRH services, unintended pregnancy prevention, HIV prevention and universal health coverage (UHC). She has co-authored over 50 peer reviewed journal articles, 2 book chapters, 4 policy briefs and 5 research reports.