Jeroen P Jansen is the Chief Scientist – Evidence Synthesis and Decision Modeling at Precision Xtract and Adjunct Professor of Health Research & Policy (Epidemiology) at Stanford University. In addition, he is Lead Scientific Advisor - Open Source Value Project (OSVP) at the Innovation and Value Initiative (IVI) where he oversees the development of open-source cost-effectiveness models. He has 15 years of research experience in the areas of evidence synthesis and economic modeling. He was an associate editor of the Research Synthesis Methods journal; and is co-author of a textbook on network meta-analysis for decision-making. Dr. Jansen has published extensively on both applied and methods research in his areas of expertise. Notable contributions are the development of guidance for consumers and producers of network meta-analysis studies (ISPOR, PRISMA), as well as the development of methods for network meta-analysis of time-to-event data, repeated measures, and integration of patient level data with study level data. Previously, he was a founder of Redwood Outcomes.