Dr. Hanna is a specialist in atmospheric turbulence and dispersion, in the analysis of meteorological and air quality data, and in the development, evaluation, and application of air quality models. Current projects include planning and analysis of dispersion field experiments (e.g., the DHS Jack Rabbit II chlorine ten-ton release trials), independent verification and validation (IV&V) of the DOD JEM 2 model, several peer-review panels, and support of litigation cases involving releases of hazardous chemicals to the atmosphere. He is a Fellow of the American Meteorological Society (AMS), the recipient of the 1994 AMS Award for outstanding contribution to the advance of applied meteorology, the 2010 Helmut Landsberg Award for research on urban meteorology, and the 2015 Henry Harrison Award for Consulting Meteorology. He is an AMS Certified Consulting Meteorologist with over 50 years of experience. During 2014, he was a Councilor of the AMS. From 1988-1997, he was Chief Editor of the Journal of Applied Meteorology. He is currently guest editor of a special issue of Atmospheric Environment concerning comparisons of dense gas dispersion models applied to the Jack Rabbit II field data.