
Joseph Semrai
Founder & CEO of Context · Thiel Fellow · Stanford CS
San Francisco, California
Joined November 2025
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Summary
Founder & product‑led CEO focused on reimagining office productivity with long‑context, agentic AI. Semrai founded Context in 2024 and positioned it as an AI‑native office suite that reasons across documents, spreadsheets and presentations; the company raised seed funding and launched publicly in 2025. josephsemrai+2
Serial student‑founder with a track record of education and HCI projects. While in high school and college he shipped several education‑focused products (Passable, Curious Cardinals, Lightning Learning) and web/HCI experiments (Catalyst Chat, Ninja, Intern AI), winning a Congressional App Challenge and local awards. congressionalappchallenge+2
Recognized early as a technical talent and operator: selected as a 2024 Thiel Fellow to pursue Explore Interfaces / Context full‑time, which underscores both investor and program confidence in his technical vision and ability to build high‑growth AI products. businesswire+1
Active open‑source contributor and hands‑on engineer. Maintains a public GitHub account with many repositories (HCI and tooling projects are prominent), reflecting a practical software engineering background and an interest in building tangible prototypes. github+1