John Robinson

John Robinson did not arrive in water the usual way. Before he was an investor he spent about a decade running a go-to-market consultancy, Mandarin Environment, helping water-related technologies break into international markets, which is also where he learned the lesson that still drives his thesis: for most water startups the hard part is not inventing the product, it is selling it. He studied at Johns Hopkins and Denison, is fluent in Mandarin from seven years in Asia, and in 2018 he co-founded Mazarine Ventures in Chicago with three partners. The thing he is known for is the frame he put on the whole sector.

John Robinson's contrarian move is to refuse the phrase "water is life." On the show he kept pulling the definition apart, pointing out that the people who actually buy water technology are rarely in the water business: a property owner for whom water is a constant headache, a bank that needs to know whether a borrower will still have water to repay a loan, a textile or pulp-and-paper maker whose biggest input risk is water. So Mazarine underwrites water as a risk that shows up across the whole economy, and scores every company on whether it genuinely helps its customer hit an environmental, social or governance (ESG) goal. It is exactly the kind of unglamorous, capital-starved corner of the water world I spend my days mapping in my Leviathan database.

John Robinson built Mazarine as a ladder rather than a single fund, and it is the clearest part of his thinking. He describes a zero-to-ten scale of company maturity: Mazarine Labs takes a raw idea from zero to one, where the scarcest resource is not money but social capital, the endorsement of veterans he can pull onto a board; Fund I backs seed-stage companies climbing from one to five million dollars in sales; Fund II carries the winners from five to ten; and a fourth lane, Bluehouse, aims modern diagnostic tools at base-of-the-pyramid communities still measuring their water with instruments from the 1970s. The checks are deliberately small, often fifty to five hundred thousand dollars, written as a supportive co-investor rather than a controlling lead, into companies like Conservation Labs (acoustic leak detection), AquaOso (water-risk scoring sold to banks) and SimpleLab (a network of environmental testing labs).

John Robinson is blunt about the money that floods into water for the wrong reasons. He told me, in so many words, that a lot of generalist impact capital is just checking the water box, glancing at fifteen or twenty deals and picking one that looks fine without really understanding the market the founder is chasing. What he underwrites instead is the founder's insight into that market, and he is unusually humble about his own thesis, calling "water as a risk" just one valid lens among many and openly inviting listeners to go hear other investors out.

John Robinson, back in 2022, made a bet that has aged well: that the field would move away from treatment toward diagnostics, and that artificial intelligence, the technology whose whole promise is to de-risk things, would become the core tool for managing water risk. He has since lived that bet. He left Chicago for London and, in early 2025, took the same thesis into climate adaptation as a partner at Mazarine Climate, investing in companies that turn hydroclimatic signals, satellite remote sensing and predictive analytics into operational control. You can hear the original version of the argument, water reframed as a four-shade risk, in his 2022 conversation below.

“What do you mean by the water industry? If you're an owner of a property globally, water is a big headache for you. But they're not in the water business. They're in the business of running a property. But water is just a big headache for them.”