Jacob leads the Residential Energy+ initiative at Rocky Mountain Institute, transforming the residential energy upgrade market in the U.S. He is also a co-author of The Carbon-Free City Handbook, a guide for cities globally. He is the former Executive Director of EcoWorks, a leading sustainability nonprofit in Detroit, Michigan. He is also the Co-Founder and former President of the Southeast Michigan Regional Energy Office an innovative collaboration of 26 local governments tackling energy improvements in their communities.