Uri Kolodny

Uri Kolodny grew up in Israel, a country whose compact technology ecosystem would shape nearly every stage of his working life. Public information about his childhood is limited, and he has generally kept his family background out of interviews, preferring to talk about products and teams rather than himself. What is well documented is his academic path, which combined rigorous computer science training with formal business education ^[1].

Kolodny earned a bachelor of science in computer science from the Hebrew University of Jerusalem, graduating magna cum laude in 1996 ^[1]. The Hebrew University's computer science department has long served as a feeder for Israel's software industry, and the degree gave him a technical grounding that later allowed him to work credibly alongside research scientists and cryptographers.

After several years in industry, he crossed the Atlantic for graduate study. He completed an MBA at the MIT Sloan School of Management in 2000 ^[1]. The Cambridge years proved consequential in a practical sense: proximity to MIT's engineering labs put him in contact with academic research that was searching for commercial application, a pattern he would repeat throughout his career.

Anyone asking who was behind some of Israel's quieter deep-technology ventures of the 2000s will find Kolodny's name attached to an unusual range of fields. Early in his career he worked as an analyst at the consulting firm McKinsey and Company, an experience that exposed him to how large organizations make decisions ^[1]. Consulting did not hold him for long. He gravitated toward building companies around hard science, often science that others considered too far from market.

His most visible pre-blockchain venture was OmniGuide, a spinoff from MIT research on photonic band gap fibers. Kolodny co-founded the company and served as its first chief executive ^[2]. OmniGuide adapted specialized optical fibers to deliver laser energy for minimally invasive surgery, a demanding application that required both regulatory patience and engineering precision. The company gave Kolodny a template he would reuse: pair a world-class academic inventor with disciplined commercial execution.

He went on to co-found Mondria Technologies, a startup focused on visualization tools for large data sets, and worked on ultrasound-based therapeutic technology for cardiovascular applications ^[1]. Between founding roles he served as an entrepreneur in residence with venture capital firms, evaluating cleantech and other emerging sectors ^[2]. By the mid 2010s he had accumulated something rare: repeated experience taking laboratory research through the awkward adolescence of company building, across medicine, optics, and software.

The defining chapter of the Uri Kolodny biography began in 2018, when he joined forces with the computer scientist Eli Ben-Sasson of the Technion, along with co-founders Michael Riabzev and Alessandro Chiesa, to establish StarkWare Industries in Netanya, Israel ^[3]. Ben-Sasson and his collaborators had spent years developing STARKs, short for scalable transparent arguments of knowledge, a form of cryptographic proof that lets one computer verify the correctness of a massive computation performed by another, quickly and without trusted setup ceremonies ^[3].

The founding division of labor was clear. Ben-Sasson, Riabzev, and Chiesa brought the cryptography; Kolodny, as chief executive, brought two decades of experience commercializing research ^[2]. The team bet that STARK proofs could solve one of the most discussed problems in public blockchains: Ethereum could process only a small number of transactions per second, and demand routinely exceeded that capacity.

Investor interest came quickly. StarkWare raised a seed round in early 2018 and followed it the same year with a 30 million dollar Series A led by Paradigm, with participation from Intel Capital, Sequoia Capital, and Coinbase Ventures, an unusually strong syndicate for a company whose core product was still mathematics ^[3]. The Ethereum Foundation later awarded the company a grant tied to delivering its technology to the wider ecosystem, a signal that the community treated StarkWare's work as public infrastructure in the making ^[3].

Any accounting of Uri Kolodny achievements starts with execution rather than invention: he did not create the STARK protocol, but he built the company that made it usable. StarkWare's first flagship product, StarkEx, launched as a dedicated scaling engine that individual applications could license. It went on to power the derivatives exchange dYdX, the NFT platform Immutable X, and the fantasy sports game Sorare, processing large volumes of trades and transfers off the main Ethereum chain while anchoring proofs of their validity on it ^[4].

The company's second act was more ambitious. Starknet, a permissionless network where any developer could deploy applications secured by STARK proofs, reached Ethereum mainnet in late 2021 ^[4]. Building it required inventing a new programming language, Cairo, designed so that ordinary programs could be turned into provable computations. Turning a bespoke proof system into a general-purpose platform was the kind of long, unglamorous product journey Kolodny had managed before in other industries.

Capital markets rewarded the progress. A 75 million dollar Series B led by Paradigm closed in March 2021, followed in November 2021 by a 50 million dollar Series C led by Sequoia Capital that valued StarkWare at 2 billion dollars ^[5]. In May 2022 the company raised a 100 million dollar Series D led by Greenoaks and Coatue at a reported valuation of 8 billion dollars, placing it among the most valuable blockchain infrastructure firms in the world during Kolodny's tenure as CEO ^[6]. Through this period he was a frequent public voice for the company, explaining zero knowledge proofs to mainstream and financial media in plain language ^[2].

Colleagues and interviewers often noted that Kolodny ran StarkWare with a founder's intensity but a manager's restraint, leaving the scientific direction to Ben-Sasson while concentrating on hiring, partnerships, and fundraising ^[2]. The arrangement held together a company that straddled two demanding cultures, academic cryptography and venture-backed software, for six years of rapid growth.

In January 2024, StarkWare announced that Kolodny was stepping down as chief executive, citing a health situation in his family. Eli Ben-Sasson, until then the company's president, took over as CEO ^[7]. The transition was notable for its orderliness in an industry where founder departures often follow disputes or scandals. Kolodny did not leave the project: he retained board seats at both StarkWare and the Starknet Foundation, the nonprofit that stewards the Starknet network ^[7].

Since leaving day-to-day management he has continued to work as an angel investor and advisor to early stage companies in fields ranging from formal verification software to food technology and energy ^[1]. The pattern of his post-CEO activity mirrors his career as a whole, spread across sectors and anchored in technically difficult problems.

For readers wondering what Uri Kolodny is famous for, the answer rests on translation. Zero knowledge proofs spent decades as a theoretical curiosity, admired in academic papers and applied almost nowhere. StarkWare, under his leadership, was one of a small number of companies that turned the technology into production systems moving real value at scale, and its trajectory helped establish validity rollups as a central approach to scaling Ethereum ^[4].

Among the basic Uri Kolodny facts worth recording: he co-founded StarkWare in 2018, served as its CEO until January 2024, previously founded companies in surgical photonics and data visualization, and holds degrees from the Hebrew University of Jerusalem and MIT Sloan ^[1][3]. He is a living figure whose story is still being written, and his influence now flows through board work and investments rather than an executive title.

His longer arc may prove instructive beyond any single company. Across OmniGuide, Mondria, and StarkWare, Kolodny repeatedly took research that most operators found impenetrable and built durable organizations around it ^[2]. In an era when startup celebrity often outpaces substance, his career offers a quieter model: find the hardest credible science, partner with its inventors, and do the patient work of making it matter.