WILLIAM J. CAVANAUGH, FASA, INCE (Bd. Cert.), is a founding partner and senior principal of Cavanaugh Tocci Associates Inc., an acoustical consulting firm based in Sudbury, Massachusetts. His distinguished career as an acoustical consultant to the world's leading architectural and engineering firms and as a teacher at architectural schools spans more than four decades. He has served as president of both the National Council of Acoustical Consultants and the Institute of Noise Control Engineering.

JOSEPH A. WILKES, FAIA, is a Registered Architect and the editor of the five-volume Encyclopedia of Architecture. He has taught at the schools of architecture at the University of Florida and the University of Maryland and has served on the Building Research Advisory Board of the National Academy of Sciences.