He spun infrastructure investing out of Alphabet, then raised $400 million to own the future one power line at a time.
A recycling robot in a sorting plant. A thermostat that sells your spare electricity back to the grid. A fiber line under a sidewalk. None of it trends. Brian Barlow built a company to fund all of it.
Barlow is co-founder and co-CEO of Sidewalk Infrastructure Partners, an Alphabet spinout that does something most investors avoid: it owns, operates, and invests in the physical guts of cities. Energy. Water. Mobility. Digital. The systems that only make the news when they fail.
SIP launched in 2020 with a $400 million check from Google and a mandate that reads more like a public-works plan than a fund prospectus. The pitch is patient capital plus new technology, aimed at infrastructure that takes years to build and decades to pay off. Barlow runs it not as a lone chief executive but as a co-CEO alongside Jonathan Winer, a structure he has kept since the company's earliest days inside Alphabet.
The method is unusual. Before deploying a dollar, SIP convenes investors, policymakers, and academics around a problem, then designs the financing and the delivery together. It is slower than writing a term sheet. It is also how roads, grids, and water systems have always actually gotten built.
SIP organizes its work around the four foundational layers of a modern city. Each is capital-hungry, slow to build, and ripe for the kind of technology that changes the math.
Relative emphasis across SIP's stated focus areas. Illustrative.
In December 2023, SIP put $100 million behind the merger of Google Nest Renew and OhmConnect into Renew Home - a residential virtual power plant that turns millions of thermostats into a controllable energy resource.
One of SIP's early bets. AMP builds robots that use machine learning to sort recyclables faster and far cheaper than human crews, rewiring the unglamorous economics of waste.
Barlow's resume starts in an unexpected place: the College of Architecture and Urban Planning at the University of Washington. He learned how cities are drawn before he learned how they are financed. The finance came next, with an MBA in finance and operations research from Columbia.
Then came three decades in the investing trenches. He began as a buy-side equity research analyst covering REITs and MLPs - the publicly traded vehicles that hold real estate and pipelines. He founded Broadview Capital Partners, a growth equity and venture firm. He spent time at Scion Capital, the Cupertino fund run by Michael Burry of "The Big Short" fame. And in 2006 he helped launch American Infrastructure Funds, where he served as managing director.
In 2017 he joined Alphabet as director of infrastructure investments inside Sidewalk Labs, the company's urban-innovation experiment. There he defined funding models and delivery methods for infrastructure - and laid the groundwork for the company he would soon spin out and run.