This episode explores the ARChiVe Registry, a longitudinal database for pediatric vasculitis, with guest Dr. Sam, a pediatric rheumatologist and bioinformatician. The discussion covers the registry's design, patient selection, and key outcomes, including remission rates, hospitalization, and damage scores (pVDI) across treatment strategies. Dr. Sam highlights how these findings inform clinical practice and discusses the challenges of observational data. The episode also touches on his unique background in social pediatrics and health informatics, emphasizing the evolving role of clinicians as both diagnosticians and data stewards in rheumatology research.