Leaving Wall Street, Hart Lambur Built UMA And Across

• Hart Lambur shifted from Wall Street to crypto, co-founding UMA to enable synthetic assets on Ethereum.
• He also helped build Across, a fast cross-chain bridge, while promoting Ethereum standards like ERC-7683.

If anyone knows what it’s like to jump from Wall Street skyscrapers to the digital bridges of Ethereum, it’s probably Hart Lambur. He may not be as familiar a name as Vitalik or CZ outside the core community, but what he built quietly laid the foundation for many of the DeFi projects we know today.

Lambur is no stranger to finance. He started his career at Goldman Sachs, a name that would make anyone take their hat off to him if it were on a business card. He worked as an interest rate trader, specifically monitoring the US government bond market.

For those unfamiliar, this job isn’t just about sitting in front of a Bloomberg screen—it’s about making multimillion-dollar decisions in a matter of seconds. Can you imagine the daily pressures?

But behind the scenes of traditional finance, Lambur had an appetite for something more open—more free. After eight years at Goldman, he founded Openfolio, a personal investment tracking platform. In short, it’s like Goodreads for stock portfolios. Openfolio was eventually acquired by Stone Ridge, and that was a sort of U-turn in his life.

How Hart Lambur Took UMA From an Idea to a DeFi Backbone

After selling Openfolio, Lambur didn’t take a long break or take a long break. Instead, he started to dive into crypto. But not just buying tokens and hoping they would go up. He wanted to build. This is where UMA (Universal Market Access) was born.

UMA is not an ordinary project. Its goal is simple on paper: to allow anyone to create synthetic assets on the Ethereum blockchain. But of course, the execution is not easy. Lambur and his team developed what is called an optimistic oracle. This term sounds technical, but in simple terms, they created a data-determining system that is “true unless refuted.” That is, efficient and frictionless. Suitable for the anti-middleman blockchain world.

Interestingly, UMA does not stand alone. At the same time, Hart also founded Across Protocol—a cross-network bridge that allows for fast and cheap transfer of assets between blockchains. In the DeFi world, speed and cost are not just about convenience, but about the life and death of a project.

Furthermore, Hart Lambur is not the type of founder who hides behind a whitepaper. He is active on social media, especially Twitter. From there, many people can read his thoughts directly, without the PR filter or winged sentences. Sometimes he criticizes the inefficient DAO, sometimes about Ethereum’s role in building the future of finance.

On the other hand, he also regularly appears on various podcasts and conferences. One of the moments that left a lasting impression was when he explained why UMA is not just a place to play around with smart contracts, but can be a bridge to broader financial inclusion. Sounds idealistic? Maybe. But all big projects often start from a head that is not easily satisfied.

No Flash, Just Focus on What Matters

Interestingly, Hart Lambur is also actively pushing for new standards on Ethereum. One of them is ERC-7683 – a standard designed to unify various cross-network actions. If you feel that the crypto world has been too fragmented, an initiative like this is worth noting.

However, Lambur never appears in a flamboyant style. There are no photos of private jets or expensive watches. He prefers to talk about technical challenges or why governance tokens should have a real function. Occasionally, he inserts subtle humor, but still keeps the rhythm of the discussion so that it does not run away from the substance.

Until now, both UMA and Across are still actively being developed. Many new projects have been born by utilizing the oracle system from UMA, and Across is increasingly used amid the increasing need for interoperability.