Mr. Nall is Vice President and Regional Director of High Performance Solutions at Syska Hennessy Group. Most recently he served as a Senior Vice President at Thornton Tomasetti. Mr. Nall is a professional engineer, a Fellow of the AIA, a LEED Fellow, an ASHRAE fellow and certified Building Energy Modeling Professional, and a certified High Performance Building Design Professional. He was Vice Chair of the ASHRAE Standard 189 committee, was a Director of the USGBC NY Chapter, the AIA National Committee on the Environment, and Vice Chairman of the USGBC Energy and Atmosphere Technical Advisory Group. He was one of Engineering News Record’s “Newsmakers of 2007.” He received the “Outstanding Practitioner Award” from the US Chapter of the International Building Performance Simulation Association (IBPSA) in 2004. He was an author of six of ASHRAE’s ten Advanced Energy Design Guides (AEDG), and is the AIA Representative on the AEDG Steering Committee. He was recipient of the ASHRAE Distinguished Service Award and New York Chapter, ASHRAE Distinguished Service Award. He has been a faculty member at the Schools of Architecture at the University of Pennsylvania, Princeton University, Cornell University and Columbia University. He has been involved in energy efficiency and sustainability in buildings for over 30 years and is the author of numerous papers in professional and technical journals.