Gavin Newsom is the 40th governor of California, serving since January 2019. A member of the Democratic Party, he previously served as the 49th lieutenant governor of California from 2011 to 2019 and as the 42nd mayor of San Francisco from 2004 to 2011. He was sworn in as Governor of California on January 7, 2019. California Gov. Gavin Newsom called for a “Master Plan on Aging” during his State of the State Address this week, an announcement that some advocates for seniors said was both encouraging and long overdue.