Dr. Zahid Ahmad Butt is an Assistant Professor at the School of Public Health and Health Systems at the University of Waterloo. He is a physician and infectious disease epidemiologist. His research applies a “syndemic” framework to examine inter-relationships between epidemics of infectious diseases, social disparities, comorbidities, and substance use, using epidemiological, statistical, spatial, and machine learning methods. His concurrent areas of interest include digital health, global health, and spatial epidemiological methods and their application to public health practice. He is an associate editor for BMC Public Health and section editor in chief of the infectious disease epidemiology section at IJERPH.