Peter Neumann, the longtime SRI International security architect and a founding member of the Trusted Computer System Evaluation Criteria, died in his sleep at a Santa Clara hospital on May 16. Complications from a recent fall and surgery led to his passing, with his daughter Hellie at his side listening to classical music, a passion he shared beyond his technical work.

Neumann’s influence stretches back to the 1970s Multics project, where his security research helped shape early operating‑system protections. At SRI he championed formal methods and risk‑based evaluation, laying groundwork for modern trusted‑computing standards. Colleagues recall his ability to translate deep theory into practical guidelines that still inform secure system design today.

SRI plans a memorial service in Menlo Park within the next month, inviting the security community to celebrate his legacy. While his passing marks the loss of a pioneering voice, the tools, papers, and evaluation frameworks he helped create remain integral to contemporary cybersecurity curricula and industry certifications.

Beyond academia, Neumann’s advocacy shaped policy discussions at the Department of Defense and influenced the development of the Common Criteria. His interdisciplinary approach—melding formal verification, risk assessment, and user‑centric design—continues to inspire a new generation of engineers who seek provable security guarantees in increasingly complex software ecosystems.