Samuel Younkin

Position title: Researcher II


Jonathan Patz

Dr. Samuel G. Younkin received his PhD in epidemiology from Case Western Reserve University and completed his postdoctoral training at Johns Hopkins University Bloomberg School of Public Health. He currently leads the Initiative for Health-Oriented Transportation (HOT) within the Climate Solutions for Health Lab led by Dr. Jonathan Patz. As part of his research he creates and analyzes population-level models of the link between active travel (walking and cycling) and public health. His work emphasizes the tremendous population health gains that can be made by incorporating more active travel into routine travel behavior, a co-benefit of many climate change mitigation policies. It is his hope that his work will inspire communities and planners to invest more in transportation networks that enable safe active travel options.


Younkin S, Fremont H, Bratburd J, De Los Santos D, Patz J. The influence of socioeconomic characteristics on active travel in US metropolitan areas and the contribution to health inequity [version 1; peer review: 1 approved]. Wellcome Open Res. 2023;8:266. doi:10.12688/wellcomeopenres.19147.1

Younkin S, Fremont H. The Health-Oriented Transportation (HOT) R Package. Published online April 10, 2023.

Younkin S, Fremont H. R Repository for “The influence of socioeconomic characteristics on active travel in US metropolitan areas and its contribution to health inequity.” Published online April 5, 2023.

Younkin S, Fremont H. HOT: An R Package. Published online November 11, 2022.

Younkin SG, Fremont HC, Patz JA. The Health-Oriented Transportation Model: Estimating the health benefits of active transportation. Journal of Transport & Health. 2021;22:101103. doi:10.1016/j.jth.2021.101103

Symonds P, Milner J, Mohajeri N, et al. A tool for assessing the climate change mitigation and health impacts of environmental policies: the Cities Rapid Assessment Framework for Transformation (CRAFT). Wellcome Open Res. 2020;5:269. doi:10.12688/wellcomeopenres.16345.2

Grabow M, Bryan T, Checovich MM, et al. Mindfulness and Climate Change Action: A Feasibility Study. Sustainability. 2018;10(5). doi:10.3390/su10051508

Vargo J, Younkin S, Patz J. 1998 – An New Implementation of the Integrated Transport and Health Impacts Model for the United States. Journal of Transport & Health. 2017;5:S73-S74. doi:10.1016/j.jth.2017.05.222