Randolph R. Croxton, FAIA, is founding principal of Croxton Collaborative Architects, P.C., New York, NY. The firm is the recipient of numerous design awards including the AIA National Honor Award for Design Excellence as well as National Leadership Awards (2005, 2008) from the U.S. Green Building Council. As a member of the National AIA Board, Mr. Croxton was instrumental in founding the AIA's Committee on the Environment and in the adoption of sustainability as the theme of the 1993 AIA National Convention. He was invited to present Audubon House and represent the AIA at the United Nation's Earth Summit in Rio de Janeiro in 1992 and the International Union of Architects at the U.N. Social Summit in Copenhagen in 1994. From 2005 to 2011, his firm has served as principal author/interpreter of the Sustainable Guidelines and Reference Manual for all projects at the World Trade Center.