Sean Armstrong is the Managing Principal of Redwood Energy, and led the design of more than half the all-electric residences built in California between 2011 and 2020, all of them affordable housing; co-authored eight practical guides to building electrification; provided legal and technical support to dozens of municipal electrification nation-wide; wrote specifications for 120V HPWHs, HVAC and Stoves that have been adopted by manufacturers; helped develop the 2016, 2019 and 2022 Title 24 California Energy Code and shift it to support all-electric; and has received Grand Prizes from the United Nations (2017) and from the Leading Builders of America PCBC Awards (2016), two U.S. Department of Energy Innovation Awards (2015 & 2020), a SoCal Building Industry Association Sustainability Award (2017), and is one of six 2022 Inductees to California's Clean Energy Hall of Fame.