Dr. Iain Walker is a scientist at Lawrence Berkeley National Laboratory (LBNL). He has more than 30 years of experience as a building scientist, conducting research on energy retrofits, zero energy homes and IAQ issues in residential buildings. He is the current chair of the US national residential ventilation standard (ASHRAE 62.2) and serves on standards and technical committees for ASHRAE, ASTM and other national and international standards and professional organizations. He is an ASHRAE Fellow, leads the US DOE national efforts on IAQ in homes and international efforts with the IEA's Air Infiltration and Ventilation Center.