Joseph Lstiburek is a principal of Building Science Corporation and a former custom homebuilder. He is internationally recognized as an authority on moisture related building envelope problems and indoor air quality. He is the developer of ADA (the Air Drywall Approach to air barriers) and the author of the U.S. DOE Handbook on Moisture Control as well as the special contributor to the EPA guidance document on Mitigating Indoor Air Quality problems in commercial buildings. He is an expert in the area of rain penetration, air barriers, vapor barriers, air quality, durability, and construction technology. He is a building science researcher affiliated with the Centre for Building Science, University of Toronto and a former national Director of Research of the Housing and Urban Development Association of Canada.