Section's research focuses on: 1) characterizing real-world emissions and activity patterns for on-road and off-road mobile sources along with regulatory and policy options to achieve regional and community air quality improvement and greenhouse gas reduction goals using laboratory, portable emissions measurement system, remote-sensing, and engine and activity data-logging technologies, 2) evaluating driving patterns, energy use, and technology advancement of electric vehicles to characterize their benefits of reducing emissions and GHG reductions and inform to the clean transportation and GHG reduction programs and policies, and 3) characterizing non-exhaust emissions such as brake-/tire-wear emissions from vehicles and brake-/wheel-wear emissions from locomotives to understand their impacts on air quality and public health and to inform relevant emissions and GHG reduction programs and policies. Working independently and under the general supervision of the Section manager, the incumbent is responsible for leading big data-driven emissions and GHG research programs, initiating innovative research solutions for implementable and cost-effective emissions and GHG regulatory and policy options, and producing clear and concise research summaries and technical papers (e.g., memos, letters, white papers, research ideas, data analysis plans, journal articles, conference and meeting presentations, and others) in order to timely, effectively inform emissions and GHG research internally and externally.