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Paul A. Offit, MD

Paul A. Offit

Dr. Offit is director of the Vaccine Education Center at CHOP and an internationally recognized expert in the fields of virology and immunology. He is co-inventor of a landmark vaccine achievement for the prevention of rotavirus gastroenteritis.


Paula M. Oliver, PhD

Paula M. Oliver

Dr. Oliver investigates the mechanisms governing T cell activation and protective immunity. Her goal is to define mechanisms that, when dysregulated, result in autoimmunity or allergic disorders like asthma.


Timothy S. Olson, MD, PhD

Timothy S. Olson Headshot

Dr. Olson aims to improve diagnostics and treatment of bone marrow failure (BMF) syndromes, and to improve clinical hematopoietic stem cell transplantation (HSCT) outcomes. He conducts clinical trials of HSCT for non-malignant hematologic diseases. His laboratory explores both basic and translational research focused on genomics of BMF and the impact of BMF on hematopoietic niche function during HSCT.


Xilma R. Ortiz-Gonzalez, MD, PhD

Xilma R. Ortiz-Gonzalez

Dr. Ortiz-Gonzalez is a physician-scientist specializing in pediatric neurogenetics. Her clinical work focuses on finding a unifying genetic diagnosis for children with rare neurodevelopmental disorders. Her research is informed by her patients and focuses on understanding how genetic changes, in particular those affecting mitochondrial function, cause disease so we can develop better treatments for these children in the future.