IVS Faculty

Daniel A. Salmon, PhD Director
Neal A. Halsey, MD Director Emeritus
Lawrence H. Moulton, PhD Co-Director
Kawsar R. Talaat, MD, Deputy Director, Clinical Research
Matthew Z. Dudley, PhD, MSPH, Epidemiologist
Rupali J. Limaye, PhD, MPH, MA, Associate Director for Behavioral Research

Daniel A. Salmon, PhD


Dr. Salmon has training, research and practice interests in epidemiology and health policy. He has focused on post-licensure vaccine safety and the factors associated with parental decisions to vaccinate or not vaccinate their children. Dr. Salmon served as the Director of Vaccine Safety at the National Vaccine Program Office, where he was responsible for coordinating federal vaccine safety activities. 

Dr. Salmon has conducted a broad range of studies examining the safety of vaccines, the rates of vaccine refusal, the reasons why parents refuse vaccines, the impact of health care providers and local and state policies on vaccine refusal and the individual and community risks of unvaccinated children. Dr. Salmon is widely published in the medical literature. Dr. Salmon is a professor in the Department of International Health where he also directs the PhD program in Global Disease Epidemiology and Control. 

updated Oct 2018

Neal A. Halsey, MD

Director Emeritus

Dr. Halsey is a Professor in the Department of International Health at the Johns Hopkins Bloomberg School of Public Health and in the Department of Pediatrics in the School of Medicine. Dr. Halsey served in the Epidemic Intelligence Service at the Centers for Disease Control and Prevention(CDC) in Atlanta. After 5 years as a faculty member at Tulane University he has been at Johns Hopkins University since 1985. 

Dr. Halsey has authored more than 240 peer reviewed publications and 41 book chapters on the prevention and treatment of infectious diseases through vaccination, and participated in the development of more than 100 guidelines for the use of vaccines while serving on advisory groups for the WHO Expanded Programme on Immunization, the Advisory Committee for Immunization Practices (ACIP) for CDC, and the American Academy of Pediatrics Committee on Infectious Diseases. 

Dr Halsey has focused his research and teaching in recent years on vaccine safety. 

updated Oct 2018

Lawrence H. Moulton, PhD

Co- Director

Dr. Moulton, is a biostatistician who focuses on issues of vaccine safety and effectiveness. He has made applied and theoretical contributions to the design and analysis of Phase II, III, and IV vaccine investigations. Dr. Moulton’s areas of expertise include statistical epidemiology and cluster randomized trials. 

He has served as a consultant to the FDA, CDC, PAHO, and WHO on issues of vaccine evaluation, and has received substantial National Institutes of Health funding for statistical research on vaccine evaluation. He has been the principal statistician on many large vaccine, HIV, and nutritional intervention trials. Dr. Moulton is a professor in the Department of International Health with a joint appointment in the Department of Biostatistics at the Johns Hopkins Bloomberg School of Public Health.

updated Oct 2018

Kawsar R. Talaat, MD

Deputy Director, Clinical Research

Dr. Talaat is a physician who is board certified in Internal Medicine, Pediatrics and Infectious Diseases. She has extensive experience in the design and conduct of Phase 1 and 2 clinical vaccine trials for new vaccines, and in the conduct of challenge studies. She has served as the Principal Investigator for Phase 1 or 2 trials for a variety of vaccines, including influenza (pandemic and seasonal), malaria, Ebola, and bacteria that cause diarrhea including Enterotoxigenic E. coli (ETEC) and Shigella. In addition to her work on novel vaccines, Dr. Talaat is interested in the safety of existing vaccines. She is the Johns Hopkins Principal Investigator for the CDC Clinical Immunization Safety Assessment group; Dr. Talaat has served on several working groups looking at vaccine safety and has co-authored a WHO-sponsored systematic review of the safety of influenza vaccines in children. She is also a member of the WHO Strategic Advisory Group of Experts Influenza Working Group. 

Dr. Talaat is an Assistant Professor in the Department of International Health at the Johns Hopkins Bloomberg School of Public Health and has a joint appointment in the Johns Hopkins School of Medicine.

updated Oct 2018

Rupali J. Limaye, PhD

Associate Director for Behavioral Research

Dr. Limaye is a social and behavioral scientist and health communication scholar. Her mixed-method work examines how various influences affect health behavior and how to leverage those influences to affect positive behavior change. She also studies how health information can best be communicated to individuals in different contexts and through different channels. In her 15 years of working in global health, she has worked in more than 20 countries, on topics including immunization, family planning, HIV/AIDS, maternal and child health, and alcohol, and has been published widely in international peer-reviewed journals. 

Dr. Limaye has a primary appointment within the Global Disease Epidemiology and Control Program in the Department of International Health and a joint appointment in the Department of Epidemiology and Health, Behavior & Society at the Johns Hopkins Bloomberg School of Public Health.

updated Oct 2018

Matthew Z. Dudley, PhD, MSPH


Dr. Dudley is an Associate in the Department of International Health at the Johns Hopkins Bloomberg School of Public Health. Dr. Dudley has coordinated several research studies exploring topics ranging from norovirus transmission in peri-urban settlements in Peru to multi-level interventions to increase vaccine confidence and informed decision making among obstetric patients. He recently published a book entitled, The Clinician’s Vaccine Safety Resource Guide: Optimizing Prevention of Vaccine-Preventable Diseases Across the Lifespan, which is available online at https://www.springer.com/us/book/9783319946931. Dr. Dudley has published in academic journals on topics ranging from hospital infection control of drug resistant tuberculosis to vaccine safety, hesitancy and uptake. He has also served as a consultant for organizations such as the World Health Organization and the Coalition for Epidemic Preparedness Innovations. 

updated April 2019