The Story
The Engineer Who Outran His Own Origin Story
The personal website at pantel.is displays exactly three words: "Here be dragons." It is the phrase old cartographers used to mark territory they did not understand, placed at the edge of the known world. It is also, perhaps, the most honest bio Pantelis Kalogiros has ever written.
He grew up in Larisa - a city in mainland Greece, son of an Air Force officer, surrounded by machines he could not resist taking apart. Technology felt, he once said, like magic. The impulse to decode that magic would cost him his university degree, his ability to go home, and eventually, his country. He got everything else in return.
In 2010, with one semester left toward a bachelor's in informatics at the Technological Institute of Lamia, Pantelis stopped going. Not because he failed. Because Greece was dissolving. The 2012 debt crisis had been building for years; mandatory military service loomed; the startup culture that might have absorbed him simply did not exist yet. While working by day as a lead JavaScript engineer at a healthcare digital marketing agency, he built open-source gesture-control libraries at night - quietly preparing for a world that had not yet asked for what he was making.
A Google Summer of Code program made the introduction. Pantelis met Radu B. Rusu - a computer vision researcher who would become his co-founder. By 2014, the two (joined by Stefan J.J. Holzer and Stephen D. Miller) had launched Fyusion, a machine learning and computer vision company with a specific, peculiar idea: that a standard smartphone could capture interactive 3D images. They patented the .fyuse file format. They built the viewer. Then Pantelis built the infrastructure to serve it to the world.
"I don't want to regret not doing something, so I do it even if it terrifies me."
- Pantelis Kalogiros
The infrastructure became the story. Fyusion's web backend, under Pantelis as SVP of Web, eventually handled 2.7 billion requests per day. Its SDK was embedded in over 200 million devices. The company served more than 100 million users across 16,000+ websites, mostly in automotive - helping dealerships show cars in three dimensions rather than flat photographs. The team grew from 4 people to 65 employees spanning 22 nationalities. Fyusion holds 120+ patents.
In late 2020, Cox Automotive - one of Fyusion's biggest customers, owner of Kelley Blue Book, Autotrader, and Manheim - acquired the company. Fyusion retained operational independence. Pantelis remained. And then, quietly, the arc shifted.
Today he sits on the other side of the table as General Partner at Cox Exponential (CX2), Cox Enterprises' early-stage AI investment vehicle in San Francisco. CX2 writes checks between $500K and $1M into companies applying AI in the physical world. The thesis is straightforward: most early-stage AI startups do not fail for lack of capital. They fail for lack of the right people with the right expertise. CX2 embeds engineers directly with its portfolio. Pantelis is the engineer.
From Larisa to San Francisco - Without a Degree or a Return Ticket
After leaving Greece, Pantelis could not go back for eight years. Unresolved mandatory military service obligations made return complicated. He did not have a bachelor's degree. He wanted a U.S. green card. Immigration lawyers cite his case today as an example of the possible: he qualified for an EB-2 NIW (National Interest Waiver) based not on credentials but on Fyusion's demonstrable economic contribution to the United States - jobs created, revenue generated, technology that mattered. The government agreed. No degree required.
The range is unusual. Most venture investors come from finance. Some come from operations. Very few still have 2,300-star GitHub projects from weekend coding sessions, or can walk a portfolio company's engineers through the specific tradeoffs of high-performance WebGL point-cloud streaming from first principles. Pantelis can. His GitHub profile follows exactly zero accounts but has 136 followers - a detail that somehow feels consistent with the rest of the biography.
The commitment to open source has been continuous. AudioMass, a fully browser-based audio and waveform editor he built and published, has 2,300+ stars and 277 forks on GitHub. He built a first-person 3D adventure game rendered entirely in CSS and HTML - no WebGL, no canvas - that now has 251 stars. These are not portfolio projects. They are the products of someone who builds things because he cannot help it.
CX2's team around him is formidable. Sebastian Thrun (Google X, Waymo), Rodney Brooks (iRobot), Ken Goldberg (UC Berkeley). The fund describes its ideal portfolio founder as "technically fearless, commercially ambitious, and building things the world isn't ready for yet." That description did not appear in a slide deck by accident. It describes the kind of person who left Greece on a one-way ticket with an unfinished degree and a repository of gesture-control libraries, and built his way to a San Francisco investment office through sheer forward motion.
On leadership, Pantelis quotes Antoine de Saint-Exupery: "If you want to build a ship, don't drum up people to collect wood and don't assign them tasks and work, but rather teach them to long for the endless immensity of the sea." His Fyusion team had 22 nationalities. He knew everyone's name. That is the kind of thing that matters more than it sounds.
