Ex-Eigen Founder Raises $20M Seed for Legal AI Startup Twin1

Lewis Liu is back with a new bet on legal AI, and this time the product is not a document-processing engine but a digital replica of the lawyer using it. His startup Twin1 has raised $20 million in a seed round co-led by Bessemer Venture Partners, aimed at building what the company calls AI "digital twins" for legal professionals.

Liu previously ran Eigen Technologies, a contract-analysis company he eventually sold to Sirion. Eigen's track record was substantial: its systems digitized more than $100 trillion in contracts and reached roughly 20% of the AmLaw 100, and it became the first AI company cleared by the Federal Reserve and FDIC to process financial contracts without human review.

Twin1 is built by much of that same team. Co-founders Tom Cahn and Huiting Liu both worked at Eigen, and the group is now applying that institutional experience to a different problem: not extracting data from contracts, but modeling how an individual lawyer actually works.

How the digital twins operate

Twin1's core offering is an encrypted, in-platform agent that learns a lawyer's habits and workflow across the tools they already use, including Slack, Microsoft Teams, Outlook, Gmail, Google Drive, and SharePoint. Rather than replacing existing software, the twin sits alongside it, absorbing context from communications and documents to act on a lawyer's behalf.

That approach has already found paying customers among elite firms. Linklaters, Orrick, and Dechert are named as law firms currently using Twin1, giving the young company a client roster that most seed-stage startups would envy.

"Twin1" positions itself less as a tool lawyers operate and more as an agent that learns to operate like they do, a distinction that matters as law firms weigh how much of their workflow to hand to AI systems.

Twin1 is headquartered in San Mateo, California, with a second office in London, a footprint that mirrors the transatlantic client base it's already serving. The dual-location structure also reflects Liu's Eigen-era relationships, since many of the firms now adopting Twin1 were already familiar with his prior company's work in contract intelligence.

The $20 million raise is modest by the standards of headline-grabbing AI rounds, but the combination of a repeat founder, a proven prior exit, and immediate adoption by AmLaw-caliber firms suggests investors are betting on execution more than a novel concept. Whether "digital twins" become a durable category in legal AI, distinct from the copilots and document-review tools already crowding the market, will depend on whether the encrypted agent model scales beyond its first marquee clients.