Dr. Iain Walker is a scientist at Lawrence Berkeley National Laboratory. He has more than 30 years of experience as a building scientist, conducting research on indoor air quality, ventilation, and reducing the energy and CO2 impacts of buildings. He is an ASHRAE Fellow and currently serves on the Residential Team of the ASHRAE COVID-19 Epidemic Task Force. He leads the US DOE national efforts on IAQ in homes and international efforts with the IEA's Air Infiltration and Ventilation Center. He works on standards and technical committees for ASHRAE, ASTM, RESNET, and other national and international organizations. His current work focuses on residential ventilation and home decarbonization.