Voorhees has worked in numerous areas of
sustainability, including
environmental impact analysis, authoring a study on “The True Costs of the Automobile to Society” for the
Boulder, Colorado Department of Alternative Transportation. In 1994, he received a patent for a
gray water processing system designed for residential water conservation. At BioServe Space Technologies, a
NASA Center at the
University of Colorado, Boulder, his research focused on bioregenerative life support systems (also known as
Controlled Ecological Life Support Systems) where he served as
principal investigator on seven
Space Shuttle experiments which were flown onboard missions
STS-50,
STS-54,
STS-57,
STS-60, and
STS-62. He has given presentations of his work on sustainable lighter-than-air transportation to such organizations as the
American Institute of Aeronautics and Astronautics, the
World Bank, the
Bioneers, the
University of Michigan Ross School of Business, and the
Anderson-Abruzzo Albuquerque International Balloon Museum. On February 22, 2011, Mr. Voorhees was issued a patent for a propulsion and maneuvering system for buoyant aircraft that eliminates the need for tail fins and allows for low speed maneuver without the requirement for ground crew. Another patent was issued to Mr. Voorhees on January 10, 2012, for an Aerostatic Buoyancy Control System that enables airships and other craft to pneumatically control their altitude without conventional ballast or the venting of lifting-gas. == Ballooning ==