Lennart Justen

Lennart Justen (known as Lenni) is a doctoral researcher at MIT's Media Lab and the Broad Institute, co-advised by Kevin Esvelt and Pardis Sabeti. He holds a BS in Physics and Political Science from the University of Wisconsin-Madison (2022) and completed his SM thesis at MIT titled "Advancing Biosecurity in the Age of AI: Integrating Novel Detection, Suppression, and Evaluation Approaches." His research focuses on biosecurity and pandemic preparedness, spanning pathogen-agnostic biosurveillance, airborne transmission suppression, and AI capability evaluation in biology, including work on the WMDP (Weapons of Mass Destruction Proxy) benchmark and the Virology Capabilities Test. He has previously held research positions at SecureBio, the Office of the Director of National Intelligence, and the U.S. State Department, and served as a 2024-25 Fellow at the Council on Strategic Risks. As of October 2025, he also serves as Research Manager for the ERA AIxBio Research Fellowship. He received early-career funding from the Long-Term Future Fund to increase his impact as a biosecurity researcher.

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