Rolf Mowatt-Larssen is an American former intelligence officer who spent more than two decades at the Central Intelligence Agency and later directed intelligence and counterintelligence at the Department of Energy. His career included overseas operations, weapons-of-mass-destruction issues, and efforts to understand nuclear proliferation and insider threats. He later became a senior fellow at Harvard’s Belfer Center and wrote on intelligence practice.

Mowatt-Larssen spent more than two decades in CIA operations, serving overseas and rising into senior counterintelligence responsibilities before leading intelligence work at the Department of Energy. Nuclear proliferation, insider threats, and the vulnerability of tightly guarded systems became central themes of his later teaching and writing at Harvard. His public UAP relevance is secondary to that career, but the experience gives him a sophisticated understanding of compartmentation, deception, and the limits of what even senior officials may know.

Mowatt-Larssen’s name appears in UAP discussions because his career touched nuclear laboratories, classified scientific programs, and the senior intelligence community. Public material does not establish him as a principal UFO investigator or firsthand witness. Claims about his private views or involvement should therefore be tied to the specific interview, source, or program making them.

After government service, Mowatt-Larssen taught and wrote about intelligence ethics, espionage, and weapons threats. That educational role made parts of a secret career available to students and policymakers without disclosing operations themselves. His later comments on anomalous subjects are best understood as another extension of a career devoted to how institutions recognize rare, high-consequence possibilities.

He provides institutional context for nuclear facilities and UAP and government secrecy. His documented expertise concerns intelligence and nuclear security. That background can clarify how sensitive scientific information is protected, but it should not be converted into implied confirmation of non-human technology without a direct, sourced statement.