Josias Zietsman is Center Director for the Texas Transportation Institute. He is an expert in transportation engineering specializing in air quality, sustainable transportation, tr...view moreJosias Zietsman is Center Director for the Texas Transportation Institute. He is an expert in transportation engineering specializing in air quality, sustainable transportation, transportation planning, and the emerging topic of public health and transportation. He has led landmark transportation air quality studies in the US. He has co-written a seminal textbook, and authored over 70 technical publications including reports and papers.view less