Buck is a licensed architect in New York, New Jersey, Pennsylvania and Maryland and is an International Certified Passive House Designer (CPHD) and a North American Certified Passive House Consultant (CPHC).

Buck is the Chair of New York Passive House (NYPH), leading the movement to promote the Passive House building standard in New York State and the New York City metropolitan area. He was a founding member of NYH2O, the first nonprofit citizens advocacy group based in New York City dedicated to protecting New York's water resources from the threat posed by fracking. He is a board member of City As Living Laboratory (CaLL), Damascus Citizens for Sustainability, and was formerly on the board of September's Mission, a 9/11 victims families organization.