Cecilia Sorensen M.D.


Dr. Sorensen is an Associate Professor of Environmental Health Sciences at Mailman School of Public Health and Associate Professor of Emergency Medicine at Medicine at Columbia Irving Medical Center. Translating research into policy, clinical action, and education in order to build resilience in vulnerable communities is the focus of her endeavors. Her recent work has spanned domestic as well as international emergent health issues related to climate change, including, heat stress and worker health in Guatemala, wildfires and health care utilization in the United States, the emergence of Zika virus in Ecuador following the Earthquake of 2016, climate change and women’s health in India and mortality following hurricane Maria in Puerto Rico. She has served as an author for the U.S. Fourth National Climate Assessment and serves as a technical advisor for the Lancet Climate and Health U.S. Policy Brief.  She is a member of the Colorado Consortium for Climate Change, a scientific advisor for the Citizens Climate Lobby and the course director for the nations’ first medical school course on climate change and human health.  She also co-directs the National Climate-Health Fellowship program, a post-residency training program for physicians.


Haley Campbell, MPH

Program Director

Haley Campbell is the Program Manager at the Global Consortium on Climate and Health Education. She received her Bachelor of Science in Environmental Science from the University of Oregon. She then earned her Master's of Public Health at Columbia University in Environmental Health Sciences with a specialization in Climate Change and Health. Haley supervises GCCHE educational programs and offerings and additionally provides strategic support to GCCHE constituent member organizations. She coordinates the GCCHE working groups and partakes in climate and health education scholarly research through the Consortium. She is passionate about environmental justice, sustainability and engaging with healthcare professionals though climate change education and activism.


Dr. Hertelendy, PhD, MHA, MS

Environmental Health Sciences, Adjunct Associate Professor

Dr. Hertelendy has over 28 years leadership experience as a hospital administrator and executive in Saudi Arabia, UAE, Canada and the USA, with a background in disaster and emergency management. Dr. Hertelendy is an Adjunct Associate Professor of Environmental Health Sciences at Mailman School of Public Health. Dr. Hertelendy teaches leadership and healthcare management in the MBA program at Florida International University in the College of Business. He is working to raise awareness internationally and educate healthcare executives towards decarbonizing the healthcare sector.

Dr. Hertelendy's research interests explore healthcare resiliency and the intersection between climate change health and disaster medicine. He studies the health implications of climate change and how technology can be used to improve both the delivery and sustainability of healthcare during disasters. He is the author of more than 80 published articles, in leading healthcare and management journals such as Harvard Business Review, numerous book chapters, and is the Guest Editor for the Journal of Emergency Management, Journal of Public Health, Associate Editor for Disaster Medicine and Public Health Preparedness and is on the editorial boards of Prehospital and Disaster Medicine. Dr. Hertelendy is also the Co-Research Director for the Disaster Medicine Fellowship at Beth Israel Deaconess Medical Center.

He is a frequent international keynote speaker on crisis leadership, disaster and emergency management, global health security and climate change.


Jeffrey Shaman, PhD

Faculty Advisor

Jeffrey Shaman is a Professor in the Department of Environmental Health Sciences and Director of the Climate and Health Program at the Columbia University Mailman School of Public Health.  He studies the survival, transmission and ecology of infectious agents, including the effects of meteorological and hydrological conditions on theses processes.  He uses mathematical and statistical models to describe, understand, and forecast the transmission dynamics of these disease systems and to investigate the broader effects of climate and weather on human health.


Kim Knowlton, PhD

Faculty Advisor

Kim Knowlton is a senior scientist and deputy director of the science center at the National Resource Defense Council and Assistant Professor in the Climate and Health Program at Mailman School of Public Health. Kim Knowlton focuses on the public-health impacts of climate change and advocates for strategies to prepare for—and prevent—these impacts, especially in vulnerable communities. As a result of her research into the links between climate change and health, NRDC has partnered with a number of city and state governments to strengthen health preparedness in their climate adaptation planning. She has also studied heat- and ozone-related mortality and illness as well as the connections among climate change, infectious illnesses, flooding, aeroallergens, and respiratory ailments such as allergies and asthma. Knowlton was a co-convening lead author on the Human Health chapter of the Third U.S. National Climate Assessment report, and among the researchers who participated in the second New York City Panel on Climate Change. She holds a bachelor’s degree from Cornell University, a master’s in environmental and occupational health sciences from Hunter College, and a doctorate in public health from Columbia University’s Mailman School of Public Health—where she now serves as an assistant professor in the Climate and Health Program of the Department of Environmental Health Sciences. She is based in New York City.


Stephan Wheat, M.D.

Adjunct Associate Research Scientist

Climate and Health Science Policy Fellow

Stefan Wheat, MD is an emergency physician at the University of Colorado Anschutz Emergency Department. He received his BA in biology at Whitman College in Walla Walla, WA. He received his MD at the University of Vermont and completed his residency training in emergency medicine at the University of Arizona in Tucson, AZ. Stefan’s interests include the intersection of climate and health, and he is the current Climate and Health Science Policy and the University of Colorado. As part of his fellowship, Stefan works as a physician fellow at the Department of Health and Human Services in their Office of Climate Change and Health Equity. Stefan is also serving as a physician fellow at Columbia University’s Mailman School of Public Health to advance the mission of the Global Consortium on Climate and Health Education. 


Elizabeth Auld, M.D.

Climate and Health Science Policy Fellow

Dr. Elizabeth Auld is an Emergency Medicine Physician working in Seattle, WA.  She completed her undergraduate degree at Middlebury College where she majored in Environmental Science and Anthropology. During this time, she discovered her interest in the intersection between environmental and human health.  She received her MD from University of Washington, and completed residency training in Emergency Medicine at New York University where she served as chief resident in her final year.

She is a 2022-2023 Climate and Health Science Policy fellow at the University of Colorado. As part of the fellowship, she is working as a physician fellow at both the CDC’s Climate and Health Program and the Global Consortium on Climate and Health Education.


Natasha Sood, MPH

GCCHE Fellow

Natasha Sood is a 4th year medical student at Penn State College of Medicine. She completed her Bachelor of Science in Environmental Science from the University of Michigan. She then earned her MPH at Columbia University in Environmental Health Science with a specialization in Climate Change and Health. She is a Founding Leader and current Executive Chair of Medical Students for a Sustainable Future (MS4SF).


Gina A. Friel, DNP, CRNP-PC

GCCHE Fellow

Gina is a Pediatric Nurse Practitioner at Annapolis Pediatrics, a large primary care pediatric practice in Annapolis, Maryland where she provides care to pediatric patients from birth through 21 years of age. Dr. Friel received her Doctor of Nursing Practice degree from Villanova University Fitzpatrick College of Nursing in December 2021 and is very excited to walk in the graduation ceremony in May 2022 along with her oldest son, Samuel, who will also graduate from Villanova University College of Engineering with a Bachelor of Science degree in Civil Engineering. 

Dr. Friel has a particular interest in pediatric obesity and fostering healthy lifestyle habits in patients of all ages. The focus of her doctoral work centered on the Pediatric Obesity and Food Insecurity Paradox. Dr. Friel’s interest in childhood obesity is further expanded by her equally passionate focus on the impact the environment has on eating patterns that ensure food security, improve human health and wellbeing, diet quality and social equity. The intersection of environmental exposures, climate change challenges and the engagement of people, communities and diverse groups is an area of interest. This passion stems,  in part, from living on the shores of the Chesapeake Bay, an experience that has further expanded her passion for understanding the vulnerabilities pediatric patients and families face related to climate change. 


Erika Strickler, MD Candidate

GCCHE Fellow

Erika is a rising fourth-year medical student pursuing family medicine. While progressing through medical school in California, she came to realize that climate change is one of the most pertinent yet under-addressed factors affecting her patients' health. After finishing her clerkship year, Erika focused on ways to become more involved in climate health education. She joined the National Academy of Medicine's Health Professional Education and Communication working group, where she contributes to efforts to expand climate education in various health professional disciplines and advocate for advancements rooted in equity and justice. She is thrilled to further expand this work during her time at GCCHE, advancing her overall goal of being a physician that serves her patients by working towards systemic change.

In her free time, she enjoys snuggling with her rescue pup and life teammate Momo, dreaming up her annual trip to the Utah deserts with her best friend (and traveling in general), cooking Filipino food for friends and family, deepening her yoga practice, and as of late, obsessively watching The Sopranos. She stays up late at night pondering the role of the antihero and what her allegiance to Tony Soprano means.