CGHE members span the University of Michigan and the globe, including faculty experts, research collaborators, scholars, and community partners. Search for Members with Keywords, Sponsors, Locations, or Categories + Sarah Hortsch, PhD, MSW, RN Evolutionary medicine and chronic disease David (Dave) Ripin, PhD Prevention and treatment of infectious diseases Elizabeth (Liz) Roberts, PhD Scientific and public health knowledge production and its effects Sylvia Akpene Takyi, PhD Air Pollution, Environmental epidemiology, hygiene, nutrition, metabolic diseases, climate change Hang Yu, PhD, MA Development economics, health impact analysis