This excellent article is from the Los Angeles Times:

A Times review of campaign finance records identified eight of San Francisco’s best-known families as being among Newsom’s most loyal and long-term contributors. Among those patrons are the Gettys, the Pritzkers and the Fishers, whose families made their respective fortunes in oil, hotels and fashion. They first backed him when he was a restaurateur and winery owner running for a seat on the San Francisco Board of Supervisors in 1998, and have continued their support through the governor’s race.

They are not Newsom’s largest donors: The families in total have given about $2 million of the $61 million that donors have contributed to his campaigns and independent committees backing those bids. But they gave while he was a relative unknown, providing crucial support to a political newcomer in the years before his campaign accounts piled high with cash from labor unions, Hollywood honchos, tech billionaires and donors up and down the state.