An internationally recognized proponent and practitioner of sustainability, Bill is president of the Integrative Design Collaborative - a consulting organization working to evolve green building design practice into an approach that is fully integrated with living systems. He is a principal of the regenerative planning firm Regenesis and the strategic environmental planning firm Integrative Design. His work centers on managing and creating frameworks for integrative, whole-systems design processes. His larger vocation is to grow new capability in the design and construction industries to engage regeneratively with our environment. . Ultimately, his objective is to improve the overall quality of the physical, social and spiritual life of our living places.

Bill served as co-chair of the LEED Technical Committee from its inception in 1994 through 2003; is a member of the LEED Advanced faculty and one of the first of twelve USGBC trainers of the LEED Rating System; a founding Board Member of the US Green Building Council; and served on the national executive committee of the AIA Committee On The Environment. He currently serves on the Board of the Northeast Sustainable Energy Association, as an advisor to Environmental Building News, and on the board of CitiLog.

Bill is a consultant, design process facilitator, and lecturer. He has participated in over 200 presentations and workshops relating to Sustainable and Regenerative Design. He has consulted on dozens of LEED projects - achieving many certifications - Certified to Platinum. He is a guest lecturer at Universities from Harvard to University of British Columbia. His clients range from New York City Department of Design and Construction, U.S. General Services Administration, Loreto Bay, Baja, Mexico, Sidwell Friends School, US Green Building Council, Genzyme Corporation, Teknion, LLC, the Willow School, various city planning agencies on the East and West coast, and many private development companies in the US, Canada, and Mexico.