The Team

PURE membership includes over 120 physicians from 10 countries with interests in global health, ultrasound and medical education as it relates to training in emergency medicine, radiology, obstetrics and gynecology, internal medicine, pediatrics, surgery and critical care, among others.  We have more than 20 attending-level physicians specializing in ultrasound that are actively involved in on-the-ground training, currently focused in Rwanda and Uganda. Below is a list of some of our key members.

President & Co-Founder

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Trish Henwood, MD

After years of global health work in Ethiopia and several Central American countries, it was really when she had access to an ultrasound machine while working with the Harvard Humanitarian Initiative in post-earthquake Haiti in early 2010 that Trish truly grasped the potential impact of this transformative technology in resource-limited settings. She recognized the need for ultrasound education programs in this area and began her fieldwork on this by performing a needs assessment of the ultrasound capacity and physician interest at seven of the largest Rwandan government hospitals in early 2011. The training needs were clear, and led to the founding of PURE. She has been leading the PURE team and working step by step toward developing, implementing, and researching our training programs ever since.
Prior to completing emergency ultrasound fellowship at Brigham and Women’s Hospital, Trish was chief resident at the Harvard-Affiliated Emergency Medicine Residency at Massachusetts General Hospital/Brigham and Women’s Hospital where she focused on global health, ultrasound and medical education.

Trish previously worked as the Director of Global Health Initiatives in Emergency Medicine at the University of Pennsylvania, and she now practices clinically as an attending emergency physician at Brigham and Women’s Hospital/Harvard Medical School. She is currently Chair of the American College of Emergency Physicians Global Health Ultrasound Subcommittee, and International Advisor to the African Ultrasound Committee of the African Federation of Emergency Medicine.

Board Member

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Vicki E. Noble, MD
Vicki Noble is the Director of the Division of Emergency Ultrasound at Massachusetts General Hospital. She is the past-chair of the American College of Physicians Ultrasound section and is on the Board of Directors for the American Institute of Ultrasound in Medicine. She has been involved in regional, national and international organizations that promote best practices for point of care ultrasound and developed local training guidelines for the residents and the quality assurance program at Massachusetts General Hospital for point of care ultrasound. In addition, she was on the steering committees that developed the international lung ultrasound practice guidelines (Intensive Care Med. 2012;38(4):577-91) and the consensus statement with the American Society for Echocardiography on point of care cardiac ultrasound (J Am Soc Echo 2010;23(12):1225-30). She has published more than 30 original articles on point of care ultrasound applications specifically as they relate to the use of this technology in the emergency department and pre-hospital setting. She is on the board of the World Interactive Network Focused on Critical Ultrasound (WINFOCUS) and has taught point of care ultrasound at the Mediterranean Emergency Medicine Congress and the European Society for Emergency Medicine as well.

Board Member


Anthony J. Dean, MD
Anthony J. Dean is the current Director of Emergency Ultrasound and the University of Pennsylvania. In this position he has implemented mandatory resident training in emergency ultrasound and a dedicated Emergency Ultrasonography Fellowship that currently accepts two fellows per year. He is also the program director for the mandatory rotation in Bedside Ultrasonography for the Pulmonary Critical Care Fellowship at the University of Pennsylvania, and trains Fellows in Surgical Critical Care, Pediatric Emergency Medicine, and Traumatology in clinician-performed bedside ultrasonography. Within the medical School, he teaches introductory bedside ultrasonography tor first-, second-, and fourth-year medical students. He has implemented an institutionally approved departmental privileging and credentialing process in emergency ultrasound. Dr Dean also has a strong interest in international medicine. He is a founding member of the WINFOCUS (World Interactive Network Focused on Critical Ultrasound), and drafted the organization’s Bylaws. He has a special interest in the potential for clinician performed ultrasonography to enhance the efficacy of healthcare in resource-poor settings, and in ways of promoting and implementing the educational programs and infrastructure to realize that potential. Dr. Dean’s current research interests are focused on ultrasonographic applications in the assessment of the critically ill, and has undertaken collaborative research projects with members of the Divisions of Trauma, Echocardiology, Critical Care Medicine, and Obstetrics and Gynecology at the University of Pennsylvania as well as the Department of Emergency Medicine at the Children’s Hospital of Philadelphia. He is involved in research in a number of educational, administrative and clinical topics. He is past Chair of Emergency Ultrasound Interest Group of the Society of Academic Emergency Medicine. He has been an invited contributing author on a number of Specialty-wide position papers and policy statements, as well as textbook chapters on both sides of the Atlantic. He is a peer reviewer for several medical journals including Academic Emergency Medicine and Annals of Emergency Medicine. He is an invited lecturer in Ultrasound conferences in Europe, North, and South America, and Australia.

Board Member


Damas Dukundane, MD
Damas is currently working as a physician in Rwanda and is interested in diagnostics, ultrasound, and clinical research. Quoted in: ‘In Desperately Poor Rwanda, Most Have Health Insurance’. The New York Times, 14 June 2010. Featured in: ‘World Healer’. Western University of Health Sciences News, 4 March 2008. He has a particular interest in serving underprivileged people and has worked extensively with the Rwanda Village Concept Project ( and the International Federation of Medical Students Association ( Most recently he has been working on retention of doctors in rural Rwanda through capacity building of the Rwanda Medical Association.

Board Member

David C. Mackenzie, MD, CM
David Mackenzie is an attending emergency physician at Maine Medical Center. After residency training at Rhode Island Hospital / Brown University, he completed an emergency ultrasound fellowship at Massachusetts General Hospital. He is interested in the development and outcomes-based evaluation of point-of-care ultrasound programs in resource-limited settings, and has extensive international experience. His other research focus is ultrasound-guided assessment of volume status and resuscitation.

Board Member

Raja Rao, MD
Dr. Rao is an interventional radiologist with interest in global health and radiology applications in resource-limited settings. He bring to PURE his prior experience putting on several ultrasound training sessions for district hospital physicians in Rwanda.

Board Member

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Resa E. Lewiss, M.D.
Resa has organized and participated in point-of-care ultrasound education courses regionally, nationally and internationally. She is the past President of the Academy of Emergency Ultrasound of the Society of Academic Emergency Medicine, a founding member of WINFOCUS, and currently the chair elect for the Ultrasound Section of the American College of Emergency Physicians. Her teaching locations have included Madagascar, Ghana, India, Sri Lanka, Brazil, Rwanda, Singapore, Italy, and France.
Resa is a graduate and former chief resident of the Harvard Affiliated Emergency Medicine Residency program in Boston, MA. She was the first fellowship class in emergency ultrasound at St. Luke’s Roosevelt Hospital Center in New York, NY. She has been Chief of the Emergency Ultrasound Division there since 2003. She is currently an Assistant Professor of Emergency Medicine at Icahn School of Medicine at Mount Sinai. She has numerous publications and chapters related to point-of-ultrasound as it relates to education, global health, simulation and national policy.

Curriculum and Research Coordinator


Josh Rempell, MD
Josh is an attending emergency medicine physician at Brigham and Women’s Hospital in Boston and has previously completed a fellowship in emergency ultrasound at Massachusetts General Hospital. He received his MPH from Harvard School of Public Health and has been an invited lecturer in emergency ultrasound around the world. He has international ultrasound experience in Kenya and Southern Sudan and extensive international research and clinical work in several African countries as well as Asia, Central and South America.

Technology and Trainee Coordinator


Sam Vaillancourt, MD, MPH
Sam Vaillancourt is an Emergency physician at St. Michael’s Hospital in Toronto. He graduated from the Emergency Medicine Royal College Training Program at the University of Toronto. In 2012, he completed his MPH from the Harvard School of Public Health with a focus on health policy. He holds a bachelor’s degree in International Development from McGill University and has done some health-sector work in Haiti, Burkina Faso, Ecuador and Sri Lanka.

Trainer Coordinator

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Megan Leo, MD
Megan Leo is the Director of Emergency Ultrasound at Boston Medical Center.  She is responsible for training attending and resident physicians within the Department of Emergency Medicine and runs a medical student elective in emergency ultrasound.  She is also the EUS fellowship director, which offers one position per year within the Boston Medical Center emergency department.  Dr. Leo has been an invited lecturer and instructor at various local US conferences and has international ultrasound experience in Kenya and Rwanda.  She has also participated in research and clinical work in Bangladesh, South Africa, Nicaragua, and Ecuador.  She has a strong interest in point of care ultrasound education research.



Elizabeth Krebs, MD
Dr. Krebs is currently an attending emergency medicine physician and global health fellow at Duke University. Liz has spent time living and learning in Mexico, Costa Rica, and Rwanda previously. She is a paramedic and spent years working in EMS prior to attending medical school. During medical school she developed her interest in international development and social justice, and residency training has instilled an appreciation for ultrasound as a rapid, effective, bedside diagnostic utility. After learning about the number of ultrasound machines that had recently been donated around Rwanda, and the significant lack of individuals trained in the acquisition and interpretation of ultrasound images, she worked to bring together her colleagues in the formation of PURE to address this discrepancy. She continues to work with PURE as an advisor to the board.

Transport and Logistics Coordinator


Jean-Paul Iyamuremeye
Jean Paul Iyamuremeye has been with PURE since the beginning.  He coordinates all PURE trainer transport within Kigali, and around Rwanda when working at district hospitals or referral centers outside Kigali.  Jean Paul is also the president of the Rwanda Heart Association and an active member of the Team Heart group working to provide global heart surgical interventions.  He is also the managing director for Good Heart Tours Ltd., a premier tour guide company in Rwanda.

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Dedicated to improving ultrasound education in the developing world