Calthos is a veteran owned small business sole proprietorship located in Woodstock, GA. Calthos specializes in providing science-based National Environmental Policy Act (NEPA) impact assessment documentation consulting services and environmental policy formulation services to Federal, state, and local governments and other organizations concerned with using the environment in a sustainable manner.


David L. Keys, BS, MA, CEP Emeritus is a long-time practitioner, teacher, and student of the U.S. National Environmental Policy Act (NEPA) of 1969 with many years’ experience implementing NEPA. He is the former Southeast Regional NEPA Coordinator for the National Oceanic and Atmospheric Administration, National Marine Fisheries Service in St. Petersburg, Florida. He is the former owner and operator of Enviro-Limit, a NEPA consulting company.  He is a retired U.S. Army officer.

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