Thomas R. Kirchner, PhD, is Clinical Associate Professor of Public Health, Medicine, and Urban Science at NYU, and founding director of NYU mobile health (mHealth). Dr. Kirchner is a clinical-health psychologist and methodologist interested in the analysis and graphical representation of “intensive” longitudinal and geographic data, including novel methodologies that link individual behavior to the real-time context in which it occurs. Dr. Kirchner’s approach targets momentary influences on the maintenance of addictive and health-related behavior utilizing both field-based (ecological momentary assessment) and laboratory-based paradigms. This includes development of novel analytical methods for the application of geographic information science (GIS) to public health and policy. Supported by funding from the US National Institute on Drug Abuse, US National Cancer Institute, and US NIH Office of Behavioral and Social Science Research, ongoing work focuses on the impact of emerging retail product landscapes on complex patterns of drug use, including the separate and combined use of tobacco and cannabis via both combusted and electronic drug delivery systems.