Leadership Team

Kathleen Chiotos, MD, MSCE

Dr. Chiotos is a core faculty member of the Pediatric Infectious Diseases Epidemiology and Antimicrobial Stewardship (IDEAS) research group at the Center for Pediatric Clinical Effectiveness (CPCE), an attending physician in the pediatric intensive care unit (PICU) at The Children’s Hospital of Philadelphia (CHOP), and Assistant Professor of Anesthesiology and Critical Care at the Perelman School of Medicine at the University of Pennsylvania with a secondary appointment in pediatric infectious diseases. She was formerly a Fellow in the Pediatric Hospital Epidemiology and Outcomes Research Training (PHEOT) program managed by the CPCE. She completed a combined fellowship in Pediatric Infectious Diseases and Critical Care Medicine at CHOP and received a Master of Science in Clinical Epidemiology from the University of Pennsylvania. Her research interests are related to the epidemiology and treatment of multidrug-resistant gram-negative infections as well as antimicrobial stewardship in the PICU setting.

Sara C. Keller, MD, MPH, MSHP

Dr. Keller is an Assistant Professor of Medicine in the Division of Infectious Disease at Johns Hopkins University School of Medicine. She is also Director of the Johns Hopkins University Osler Medical Residency Training Program Patient Safety and Quality Improvement Pathway.

Dr. Keller’s research interests focus on improving the quality of care of patients receiving parenteral antibiotics outside the hospital, measures, and outcomes among patients with central venous catheters in the home, and improving ambulatory antimicrobial stewardship.

Dr. Keller received her undergraduate degree from the University of Maryland, her masters of public health degree in epidemiology at the University of North Carolina, her medical degree from Duke University School of Medicine, and her masters of science in health policy research degree from the University of Pennsylvania Perelman School of Medicine. She completed her postgraduate training in internal medicine at the Johns Hopkins School of Medicine. She underwent subsequent training in infectious diseases and in the Centers for Healthcare Improvement and Patient Safety at the University of Pennsylvania Perelman School of Medicine.

Joshua Schaffzin, MD, PhD

Dr. Schaffzin is a Pediatric Infectious Diseases Physician at the Children’s Hospital of Eastern Ontario (CHEO) and Associate Professor of Pediatrics at the University of Ottawa. Until November 2022, he was with Cincinnati Children’s Hospital Medical Center as the Director of the Infection Prevention & Control Program and Associate Professor of Clinical Pediatrics. He received his medical degree from University of Cincinnati College of Medicine and has been in practice for more than 20 years. He completed his training in medicine, molecular genetics, biochemistry, and microbiology as a member of the University of Cincinnati College of Medicine Physician Scientist Training Program, followed by a pediatric residency at Cincinnati Children’s Hospital Medical Center. He then was accepted to the Centers for Disease Control and Prevention’s Epidemic Intelligence Service, serving in Albany, NY at the New York State Department of Health. He stayed on at the NYSDOH for three additional years before coming back to Cincinnati Children’s as a surgical hospitalist for 5 years. He then completed a Pediatric Infectious Fellowship in 2017, and was hired as the associate director of Infection Control and Prevention.

Dr. Schaffzin has been recognized for his work on outbreak investigation and mitigation, and as a clinical educator. He founded and co-chaired the AAP Surgical Care Subcommittee for the Section on Hospital Medicine, and currently serves as a co-leader of the Solutions for Patient Safety Surgical Site Infection Prevention group.