Meet Our Residents

Internal Medicine Global Health Residents

Teresa Liu, MD, MPH

A California native, Teresa attended Stanford University for her undergraduate studies, completed her MPH from  More Johns Hopkins Bloomberg School of Public Health, and earned her MD from the University of Illinois.  She also has had experience working in basic sciences research at the National Institutes of Health, and was an Allen Rosenfield Global Health Fellow with the CDC country office in Nigeria, where she worked on epidemiological surveillance for HIV/AIDS and multi-drug resistant tuberculosis.  As a part of the global medicine track (GMED) at the University of Illinois, Teresa worked on a capstone project examining mobile health technologies and health behavior change in rural Uganda.  

Teresa is a first year internal medicine resident in the global health track at Stanford University.  She chose the global health program at Stanford for its mentorship, the vast opportunities for interdisciplinary collaboration and the flexibility in allowing its residents to pursue their global health interests in addition to superb clinical training.  Teresa would like to continue her interests in mobile health technologies and further explore the interplay of health policy and health economics to create sustainable healthcare infrastructure in low and middle income countries.  


Joshua Biddle, MD

Josh Biddle is a junior resident in the global health track of the Stanford University internal medicine program. He earned his   More  M.D from the University of California, San Francisco and did his undergraduate work at UC Berkeley and the City College of San Francisco.

Josh first started working with underserved populations as a student at the City College of San Francisco when he volunteered in the emergency department at San Francisco General Hospital. From there he began volunteering as a medical assistant at the Glide Memorial Church Health Clinic
in San Francisco’s Tenderloin District. Once at UC Berkeley he became a GED tutor at San Quentin State Prison. Around this time he also went to Nairobi, Kenya to volunteer at a clinic and learning center in one of the city’s poorest urban slums.

After graduating from UC Berkeley, he again spent a summer volunteering at a rural hospital in western Kenya. Between his first and second year of medical school he returned to Kenya to work on a project that investigated the effects of integrating family planning and HIV services in rural health clinics. After his third year of medical school, he was awarded a 9-month Fulbright Scholarship and returned to Kenya for a fourth time to help coordinate an NIH-funded case-control study of Burkitt’s Lymphoma around Lake Victoria. Finally, before beginning his internal medicine residency at Stanford, he spent two months in the country of Georgia on a CDC-Hubert Global Health Fellowship coordinating a project to evaluate the Ministry of Health’s hepatitis C testing and treatment program in the penitentiary system.

Josh choose the Global Health Track at Stanford because of the it’s flexibility, mentorship support, protected research time, funded travel, and the vast array of interdisciplinary opportunities across the wider Stanford campus. His research interests include global oncology and hepatitis. He is also interested in learning more about health policy and economics and developing the necessary tools to understand and ultimately implement large scale, public health initiatives in the developing world.


Nicholas Degner, MD, MPH

Nicholas Degner was first inspired to go into medicine and global health while performing graduate laboratory research on  More HIV pathogenesis and prevention at the Aaron Diamond AIDS Research Center at Rockefeller University in New York City. The following year he enrolled in medical school at the University of California, San Diego. At UCSD, Nicholas had the opportunity to spend a summer in Mozambique conducting research aiding in the development of an easy-to-use, low cost, field-portable device for the simultaneous diagnosis of HIV and its numerous co-infections. With the ability to integrate and apply both basic science and epidemiology to clinical challenges, Nicholas was inspired by this translational approach to global health.

Seeking to improve his skills in epidemiology and biostatistics, Nicholas pursued an MPH at the Johns Hopkins Bloomberg School of Public Health. At Johns Hopkins he had the opportunity to continue his interest in translational research, particularly novel diagnostic tests, conducting laboratory research with the Center for Tuberculosis Research evaluating microRNAs as potential biomarkers of tuberculosis infection and treatment response. He also had the opportunity to conduct field research in rural Zambia to assess the potential of incorporating environmental factors into malaria case detection methods.

Nicholas also has an interest in human rights. At UCSD, he worked with the San Diego County Jail system to conduct a study evaluating methods to screen newly admitted prisoners for tuberculosis. At Johns Hopkins, he worked with the Center for Public Health and Human Rights to put out a report on human rights abuses, particularly barrel bomb attacks, carried out against medical personnel during the Syrian Civil War.


Andrew Chang, MD

Andy Young Chang completed his residency training in the global health track of the Stanford University internal medicine program in 2016 and currently serves as a chief resident. He received More  his M.D. from Stanford and his B.Sc. in molecular biology with honors from Yale University.

His experience in global health has been at both the community and international levels. As an undergraduate, he volunteered as a social services worker for underserved patients in New Haven, CT. In medical school, he coordinated the Hepatitis B program at Pacific Free Clinic, a student-run initiative vaccinating and monitoring uninsured HBV-positive or at-risk populations in San Jose. Overseas, Andy interned with Nyaya Health, assisting the organization in collaborating with Nepal’s national Ministry of Health to establish a hospital in rural Achham. He then trained in design thinking at Stanford’s Hasso Plattner Institute of Design, where he partnered with the International Centre for Diarrhoeal Disease Research, Bangladesh to conduct on-site needs finding and user testing for a pediatric ICU device in Dhaka and Rangpur.

Andy chose to attend Stanford for his residency due to the remarkable flexibility of the global health track, along with its opportunities for mentorship in developing a research career. His current academic interests include investigating health outcomes and cost-effectiveness of cardiovascular disease in low- and middle-income countries. His other professional activities involve generating and evaluating appropriate medical technologies, in particular their role in combating non-communicable diseases in the developing world. In residency, he completed clinical rotations in Rwanda and Uganda, during which time he also conducted mixed methods research on the characteristics and motivations in women of reproductive age with rheumatic heart disease.


Rebecca Tisdale, MD

Rebecca grew up here in Palo Alto and developed an interest in global health while obtaining an undergraduate degree in Human Biology at Stanford. After graduation,   More she spent a year as a course associate for the Human Biology core course sequence here and then deferred medical school for two years to complete a Master of Public Affairs degree, which she did as a joint degree at Sciences Po in Paris and the London School of Economics. Through that experience, Rebecca had the opportunity to intern at the French National Health Authority, which researches and implements health policy in France, and work with the UK's international development agency, DFiD, on a project about the cost of protecting against malaria in sub-Saharan Africa.

During medical school at Columbia University, Rebecca spent a summer studying HIV clinics in Ethiopia and how different provider cadres cooperated for cost-effective and high-quality care; later,  she researched implementation of electronic medical record-based tools and their impact on physicians' workflows back in New York. She hopes to spend her career working at the intersection of global health, health policy, and informatics, and is delighted to be back at Stanford and participating in the global health track for this phase of training. 


Yoanna Pumpalova, MD

Born and raised in Bulgaria, Yoanna immigrated to the United States when she was 13. She attended  More  Barnard College and earned her MD from Weill Cornell Medical School in New York City.

Yoanna is currently a junior internal medicine resident in the global health track at Stanford University. She is interested in primary care delivery and the management of chronic illnesses globally. After her training, Yoanna hopes to work on improving primary care delivery in rural Bulgaria and advancing the medical training of local doctors, specifically in the area of geriatrics. 


Pediatric Global Health Residents

Gavin Hartman, MD, MS

Gavin Hartman MD, MS is a resident in the Combined Pediatrics-Anesthesiology Program at  More Stanford. His global health interests are focused primarily on education and transfer of knowledge and skills at the community level. He is also, interested in quality improvement, particularly of the under-5 population and their access to health care. He chose global health at Stanford because he was involved in some global health work prior to Stanford and after hearing of the program during his interview he was excited about the pace of growth the program was experiencing. The immense Institutional and Faculty support also made the decision that much easier. He found that the breadth of experience and knowledge of the Faculty is unmatched elsewhere.

Prior to residency, his experiences in global health started after undergraduate school he worked as a Rural Health Care Volunteer for the United States Peace Corps in Malawi, Africa. His commitment lasted just over 2 years and he primarily focused on maternal and child health, education, and micro finance. He also actively worked with HIV/AIDS education and prevention programs. During medical school, He went to rural Tecolutla, Mexico and conducted outreach health clinics for two weeks. At the end of medical school he returned to Malawi where he worked at a District Hospital for 8 weeks in all areas of medicine. He hopes to continue to educate and assist medically resource destitute communities throughout his career as a physician.


Adam Was, MD

Adam Was is a resident in the combined pediatrics and anesthesia program, and is in the Pediatrics Global Health Track More . Adam’s interest in global health began in college at MIT’s Development Lab, when he had the opportunity to design a chlorinating device for wells in Zambia. After college Adam spent two years working in Africa for the Clinton Foundation Health Access Initiative, which solidified his passion for global health. At Harvard Medical School he continued his work in global health, conducting research on a diagnostic device for MDR-TB. Adam chose the combined pediatrics and anesthesia residency program at Stanford for the opportunity to develop the diversified and deep clinical skills needed to care for children abroad. He looks forward to practicing medicine in global health settings after residency.


Nichole McCalvin Wang, DO, MPH

Nichole is a second year pediatric resident at Lucile Packard Children’s Hospital, Stanford University More  School of Medicine.

While attending Case Western Reserve University as an undergraduate, Nichole volunteered as a HIV/AIDs counselor at a local free clinic which is where she became interested in public health. She received a Masters in Public Health degree from Brown University, where she focused her studies on global health and worked as a HIV/AIDS project coordinator for the Uganda Village Project. Her project involved exploring access to health care resources in the districts surrounding Iganga, Uganda.

During her time in rural Uganda interviewing health care workers and visiting hospitals, she became interested in medical education as a path to contribute to the healthcare system in international settings. After she returned from Uganda, Nichole received her medical degree from UNT Health Science Center. Throughout medical school, Nichole remained involved in public health through her involvement with the Global Health Initiative and with organizing a health fair for the refugee community of Fort Worth.

As a member of the global health track, her specific interests lie in medical education in resource-limited settings.


Charlie Wickre-
masinghe, MD

Walter “Charlie” Wickremasinghe is a pediatric resident at Stanford University More 

specializing in Global Health. He earned his M.D. from Texas Tech University Health Sciences Center and his B.A in Creative Writing and Chemistry from Texas Tech University.

During his extensive traveling, Charlie has witnessed the healthcare disparities found in various nations and has participated in medical volunteer activities. He developed a special interest in medical education, health literacy, access to care and emergency medical services in Southeast Asia.

He chose to pursue global health at Stanford to gain further experience in tropical medicine and to learn innovative methods to enhance healthcare. In addition he hopes to gain an improved knowledge of non-profit governmental organizations in the hopes of creating an organization to address specific health deficits in Southeast Asia. 


Mary Le Chiou, MD

Mary Le Chiou has lived in Massachusetts most of her life, exploring the western side of the state for undergrad at UMass Amherst More 



 and venturing to central MA for medical school at UMass Med. Growing up in Boston was an awesome experience filled with my large extended family, delicious home-cooked Vietnamese food, weekly fishing trips at Cape Cod in the summer, and snowball fights each winter.

After visiting Northern California during spring break of her third year of med school, however, she was hooked. She got a chance to do a sub-I at Packard in the summer and knew she could not see herself doing residency anywhere else.

As far as my career goals, she's interested in advocacy and working with the urban pediatric population to address the myriad of social issues that impact their health. She is also interested in global health and has visited Vietnam and Costa Rica to provide primary care to rural populations.