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HBN experts consult on healthy building practices that increase transparency in the building products industry, reduce human exposures to chemicals in building materials and create market incentives for healthier innovations in manufacturing. HBN clients include Google, Inc.,  the Arup Group, Perkins + Will, The City of San Francisco, Kaiser Permanente, the Blue Green Alliance and the Durst Organization. 


HBN Consultants


Bill Walsh
Bill Walsh, Founder and President of the Board of Directors, is widely recognized as a leader in the environmental community and an expert on materials health in the built environment. Bill has provided the long-term vision for the Healthy Building Network since February 2000. Under his leadership, HBN eliminated arsenic from pressure-treated wood, restricted formaldehyde emissions, created the Green Guide for Health Care and launched the Pharos Project. He is a visiting professor at Parsons The New School for Design and a founding Board Member of the Health Product Declaration (HPD) Collaborative. The Health Product Declaration is the first open standard format for reporting building product contents and associated health hazards. In 2012 Bill received the US Green Building Council's Leadership in Advocacy Award and was named a Fellow at the Lowell Center for Sustainable Production at the University of Massachusetts. Previously he served as a national campaign director at Greenpeace USA and held staff attorney positions with the U.S. Public Interest Research Group and the Institute for Public Representation of Georgetown University Law Center. He holds a JD from Northeastern University School of Law and LLM in Public Interest Advocacy from Georgetown University. 

Tom Lent
Tom Lent, Policy Director, has spent over 35 years working on the environmental impact of buildings, materials, and energy in the private sector and with public interest groups.  He coordinates policy development for the Pharos Project and engage in national standards development.  Tom oversees Pharos rating criteria and the Chemical and Material Library, and provides support in product category development and product scoring review. He recently headed the HPD Collaborative Pilot Committee that developed the Health Product Declaration Standard.  He also co-coordinated development of the Green Guide for Health Care (GGHC), the US Green Building Council's LEED for Healthcare and the Sustainable Bioplastic Guidelines and has co-authored a wide range of studies of the comparative health and environmental impact of floorings, plastics and other building materials.  He also sits on a variety of standards setting committees for indoor air quality and safer materials. Tom has received the following awards: 2012: USGBC National Leadership in Advocacy with Bill Walsh, 2009 - US EPA Association Region IX - Outstanding Achievement for Pharos Project. 2004 - US EPA Association Region IX Outstanding Achievement - For his work in transforming the building materials market.

Jim Vallette
Jim ValletteResearch Director, has spent his career exposing global environmental issues. Jim’s work has inspired a global ban on the export of toxic waste; shut down toxic waste incinerators in the US and overseas; identified the companies and countries responsible for the ozone hole; curtailed international government finance for oil and coal production; and exposed the smuggling of ozone-depleting chemicals and illegally-harvested fish and timber. Upon joining HBN in 2005, following the devastation of hurricane Katrina, Jim helped to develop a model for rebuilding affordable housing on the Gulf Coast  through healthy modular production. Since 2009, Jim and the HBN research team have been characterizing the contents, hazards, and positive attributes, of all building materials through the Pharos Project. He also founded the Toxic Trade Campaign for Greenpeace International. 

Research Team

HBN's consulting work is backed by the rigorous research of the Pharos Project team



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