Alexander Leishman

There's a detail buried in River's origin story that explains everything about how Alexander Leishman runs a company. When most Bitcoin startups were integrating third-party custodians and shipping fast, Leishman insisted on building River's own custody system from scratch. He called it "the slow, hard way." He still calls it that. And he's right - it was harder. It was also the entire point.

Leishman arrived at Bitcoin from an improbable direction. He studied aerospace engineering at the University of Maryland - a discipline that rewards exactness, where tolerances aren't guidelines and failure modes are documented before a single bolt is tightened. That precision carried forward. After Maryland, he went to Stanford for a master's in computer science, and there landed a teaching assistant role for the first Bitcoin class the university ever offered, run by Professor Dan Boneh. The year was roughly 2014. Most of his Stanford peers were interviewing at Google. Leishman was grading homework about cryptographic hash functions and dreaming about monetary systems.

Before Stanford was finished, he was already in the Bitcoin industry. MaiCoin, Taiwan's largest digital asset exchange at the time, brought him on as an early engineer in 2014. He didn't just write features - he found and patched security vulnerabilities in critical financial infrastructure, and built merchant APIs that real businesses would use. It was an education in how Bitcoin systems break that no classroom could replicate.

The career that followed reads like deliberate reconnaissance. Airbnb hired him as a security software engineer - one of the most demanding trust-and-safety engineering environments in consumer tech. Then Deloitte, where management consulting taught him how large financial institutions actually make decisions. Then Polychain Capital, the crypto-native venture fund, where he sat at the intersection of investment and engineering for Bitcoin infrastructure bets.

Each stop added a layer. Security. Enterprise scale. Capital allocation. By 2019, he had seen enough to know what he wanted to build - and why everyone else was building it wrong. He co-founded River with Andrew Benson, and the company has been pointedly, deliberately Bitcoin-only ever since.

River is not a crypto exchange that lists Bitcoin alongside hundreds of other tokens. It is a regulated financial institution that offers brokerage, custody, and Bitcoin mining products to individuals and institutions. Zero-fee recurring purchases. Lightning Network integration. And - critically - custody that River actually holds. Not a third party. Not a sub-custodian. River.

The Series A in March 2021 - $12 million led by Goldcrest Capital - brought in a notable cast. Polychain Capital, his former employer. Craft Ventures. M13. Castle Island. And, in a detail that gets raised in almost every profile of River, The Kraft Group - the family behind the New England Patriots. The total funding reached $17.7 million. The company has grown to over 140 employees.

Leishman's long-game thinking extends beyond River's balance sheet. In July 2024, he joined the board of Brink, a nonprofit that funds Bitcoin core developers and protocol research. The move was characteristically understated for someone with his profile. No press release about "giving back to the ecosystem." Just a board seat at an organization doing the infrastructural work most Bitcoin companies benefit from but few actively support.

His policy engagement has grown with River's profile. The 2025 Bitcoin Policy Summit in Washington D.C. put him in conversation with regulators and lawmakers. His thesis - that Bitcoin will eventually be recognized by most countries as a fixture of international economic systems - has moved from fringe speculation to mainstream financial discussion faster than almost anyone predicted when he was TA-ing that Stanford class.

On Twitter, where he posts as @Leishman with over 47,000 followers, Leishman's voice is direct and technical without being inaccessible. He talks about custody risks, Lightning Network capacity, quantum threats to Bitcoin's cryptography, and the structural vulnerabilities of custodians who don't actually hold what they claim to hold. The Prime Trust collapse - in which a major Bitcoin custodian went bankrupt and clients lost access to funds - became a case study he references often. River built its own custody systems, he notes, so that it could never be in that position.

The GitHub profile (@leishman) offers a window into the engineering sensibility behind the CEO role. Projects there include a custom lightweight Bitcoin node analysis tool called "yam" - not a product for launch, just a tool he built because he needed to understand something precisely. That instinct is River's competitive identity in miniature: when off-the-shelf solutions exist, Leishman tends to ask whether they're actually good enough before using them.

Aerospace engineers and Bitcoin founders share a professional habit of specifying tolerances that most people find excessive. The bridge will hold ten times the expected load. The custody system will not rely on a single counterparty. The financials will be public so customers can verify. These aren't marketing positions for Leishman - they're engineering requirements. The slow, hard way is usually the only way that actually works.