Sean Armstrong is the Managing Principal of Redwood Energy and has worked for 25 years in building electrification, designed the retrofit and new construction of more than 10,000 all-electric residences for disadvantaged populations, co-authored five practical guides to building electrification, provided legal and technical support to dozens of gas bans nationwide, helped develop the 2016/2019/2022 and 2025 Title 24 California Energy Codes, and has received sustainable design awards from the United Nations, the U.S. Department of Energy and the SoCal Building Industry Association.