- Role
- Co-founder and CEO, Ava Labs
- Education
- Robert College (Istanbul); Princeton (BSE); University of Washington (PhD, 2002)
- Before Ava Labs
- Professor of computer science at Cornell; co-director of IC3
- Known online as
- @el33th4xor
Emin Gün Sirer
Sirer is a Turkish-American computer scientist who spent two decades as an academic before becoming a chief executive. He grew up in Turkey, studied at Princeton, and earned his doctorate at the University of Washington in 2002 with work on operating systems and virtual machines. Along the way he worked at Bell Labs, DEC and NEC. He joined Cornell’s faculty, where his research covered operating systems, distributed databases and peer-to-peer networks.
Karma, 2003. His first brush with digital money came five years before Bitcoin. Karma was a currency for file-sharing networks, designed to reward people who shared and charge those who only took. It used a distributed “bank” rather than a central server. It never ran as a real economy, but it is often cited as one of the first peer-to-peer currency designs.
The Bitcoin critic. In 2013 Sirer and Ittay Eyal published “Majority is not Enough”. Bitcoin was assumed safe as long as no miner controlled half the computing power. They showed that a miner with about a third could earn more than its fair share by hiding blocks, a tactic they called selfish mining. The paper is among the most cited in the field. He followed it with Bitcoin-NG, a scaling design, and with proposals for Bitcoin “vaults”. In 2016 he co-wrote a call for a pause on The DAO, pointing to security flaws days before it was hacked.
From critic to builder. At Cornell he co-directed the Initiative for Cryptocurrencies and Smart Contracts (IC3) and co-founded bloXroute Labs, a networking company. The Avalanche protocols grew out of his group’s work, and he left full-time academia to lead Ava Labs.
Public persona. Sirer is combative, funny and very online. He argues in public with Bitcoin maximalists, Ethereum researchers and Solana supporters alike. Supporters see a rare founder who can explain the mathematics himself. Critics see a habit of overselling and of picking fights. He has also worked the policy circuit: he joined the CFTC’s Technology Advisory Committee in March 2023 and testified to the US House Financial Services Committee that June.
Controversies. In August 2022 a site called Crypto Leaks published secretly recorded video of lawyer Kyle Roche and alleged a covert pact with Ava Labs to sue competitors. Sirer denied any illegal or unethical arrangement; Roche withdrew from several cases and left his firm. In April 2025 the New York Times reported that Ava Labs had donated $1 million to a political committee supporting Donald Trump. And the Foundation’s 2022 Terra deal remains a talking point for those who question his judgement.
As of October 2026 he is still chief executive, spoke at the New York summit in September, and continues to sit at the centre of the project’s technical direction.