David W. Altenhofen, AIA, is the Technical Director for the Building Enclosure Practice of RWDI, a world-wide consultancy focusing on scientifically improving how buildings perform in their exact environment. Altenhofen applies his 40 years of experience providing technical advice and quality assurance to a team of consultants bettering the building enclosure for a wide variety of projects. Altenhofen has been involved in leadership roles in building enclosure performance for more than 20 years as a principle in large architecture and consulting firms. He is active in the industry and served on many local and national committees, including on the Building Enclosure Technology and Environment Council, as the National Chair of the Building Enclosure Council and a board member of ABAA. Altenhofen worked on the NIBS committee to publish Guideline 3 for Building Enclosure Commissioning, authoring the chapter on Design Phase. He is currently involved with RAINA and the AIA on improving definitions for building enclosure terms to improve industry communication.