Welcome back to The Stratosphere.

Today, a dive into the black boxes that are billionaire family offices, and that specifically of Google co-founder Sergey Brin. I’d love to report on more intriguing family offices—reply to this email with any ideas or tips.

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But first, four quick nuggets to share:

• Stacey Abrams, a favorite of the Silicon Valley donor set and the Democratic candidate for governor in Georgia, is traipsing through the Bay Area this week for five fundraising events, according to invites I’ve seen. The events begin tomorrow afternoon and end with a Friday breakfast in Marin hosted by longtime Democratic mega-donor Steve Silberstein and featuring Jennifer Siebel Newsom, the wife of California's governor...

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But Bayshore has a fascinating story, in part because it is so private. Despite its estimated $100 billion in assets under advisement—greater than the endowments managed by Harvard and Yale combined—Bayshore has no website featuring its investment strategies, ultra-experienced security personnel, executive chefs, or yacht captains. There is no florid Silicon Valley-inspired mission statement describing how it is changing the world. Instead, the organization at the center of one of the industry’s most epic feuds and divorces is cloaked in secrecy—or in the delightful argot of the U.H.N.W., client discretion—which is, by design, the central value proposition of the entire family-office industry...