The Technical Committee in Architectural Acoustics deals with sound in the built environment. Any type of building requires consideration of sound during the design process. In some cases, sound quality is very important (e.g., concert halls), in others, sound clarity is essential for speech communication (e.g., classrooms) and in some, the presence of unwanted sound can be detrimental (e.g., hospitals). All of these scenarios are considered by architectural acoustics. Because of the broad range of applications, TCAA often crosses interests with other Technical Committees. Noise, Musical Acoustics, Psychological and Physiological Acoustics are some of the most common ones to hold joint sessions with and have research and application interests in common. As TCAA is one of the largest ones in the Society, it also has a great number of subcommittees dedicated to specific topics such as Classroom Acoustics or Green Buildings. The committee members are also varied, with a good mix of academics, industry and practitioners, as well as students.