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The company’s employees have been recruited from Google, Goldman Sachs Group Inc., Deutsche Bank AG and other family offices, according to LinkedIn profiles that list Bayshore as their employer. It has employed at least 47 people according to Department of Labor filings. These include a chief of staff and manager of the family’s New York City home, who oversaw construction, recruited domestic staff and provided personal shopping.

Brin also owns Passerelle Investment Co., a real estate firm. It’s bought properties in Los Altos to help revitalize the town for businesses and families, according to Passerelle’s website.

Representatives for Bayshore declined to comment.

Brin, 41, emigrated to the U.S. from the Soviet Union as a child with his family. He also runs the Brin Wojcicki Foundation with his wife, Anne, that disburses charitable donations and supports human rights.

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Brin is the 21st richest person in the world, according to the Bloomberg ranking. Controlling a fortune of that size requires professional security. Bayshore’s brought in the former Navy Seal to provide protection, according to a LinkedIn profile. A former U.S. Secret Service agent directed security programs, and a former SWAT team operator oversees the family’s properties and emergency procedures.

Some of the largest family offices have operation centers to monitor people and property, said Christopher Falkenberg, a former U.S. Secret Service agent and founder of New York-based Insite Security that provides protection services to clients such as family offices.

There are layers of personnel including former military and law enforcement experts who are responsible for locks on doors and gates, background checks on staff, and managing travel and aircraft security, Falkenberg said.

They don’t come cheap. A security director who’s a former FBI agent can command at least $200,000 a year, he said. That can be double a typical salary working for the government.