The Return of Mohsen Fakhrizadeh’s Ghost: Who’s Really in Charge of Iran’s Nuclear Ambitions?

By Shyam Bhatia

London, July 12, 2025. When Mohsen Fakhrizadeh was assassinated on a lonely road east of Tehran in November 2020, the Western media momentarily lit up with speculation. Iran’s nuclear ambitions, long denied and endlessly debated, suddenly had a face — and that face had been blown away by a surgical strike of stunning precision.

For months, officials from Tel Aviv to Vienna insisted that Fakhrizadeh’s death would set back Iran’s covert weapons programme by years. But nearly four years later, that assumption looks increasingly hollow. Iran’s enrichment levels are higher than ever, its missile program is surging, and the regime — far from retreating — appears to have absorbed the hit and restructured its nuclear command. Fakhrizadeh may be gone, but his ghost never left.

For decades, Mohsen Fakhrizadeh operated in the shadows. Born in Qom — Iran’s clerical capital and ideological nerve centre where Ayatollah Khomeini once studied, taught, and built his revolutionary base — in either 1958 or 1961, he studied nuclear physics at Shahid Beheshti University, earning his BSc in 1987. He went on to complete advanced studies at Isfahan University of Technology, where he received a PhD in nuclear radiation and cosmic-ray physics. Starting in 1991, he taught physics at Imam Hossein University—an elite IRGC-affiliated institution—while rising through the ranks to become a Brigadier General. He led Iran’s Physics Research Center at Lavizan-Shian in the 1990s and early 2000s, overseeing centrifuge procurement and early warhead design efforts.

A meticulous and disciplined figure, he earned his PhD in nuclear engineering from Imam Hossein University in Tehran, an institution closely tied to the IRGC and known for defense-related research. A senior officer in Iran’s Islamic Revolutionary Guard Corps (IRGC), Fakhrizadeh trained as a physicist and later specialised in nuclear engineering.

He headed the AMAD project, Iran’s clandestine effort to develop nuclear weapons. Although Iran claimed the AMAD project ended in 2003, intelligence reports from the IAEA, Israeli agencies, and Western sources consistently suggested otherwise.

Fakhrizadeh’s name came to international prominence in 2018, when Israeli Prime Minister Benjamin Netanyahu unveiled a cache of documents seized from Tehran’s “nuclear archive.” Standing before a PowerPoint slide that read “Remember that name,” Netanyahu revealed Fakhrizadeh’s central role in weaponisation research.

The man himself remained elusive: only one confirmed photograph existed, and he was shielded by layers of secrecy. Within Iran, he oversaw SPND, the Organisation of Defensive Innovation and Research, believed by Western officials to be the post-AMAD umbrella under which weaponisation research quietly continued.

In the final months of his life, Iranian state media also credited him with helping develop COVID-19 testing kits and launching a domestic vaccine effort known as FAKHRAVAC — a name clearly designed to mythologise him further.

Fakhrizadeh was killed in Absard, a town about 70 kilometres from Tehran. Early Iranian accounts claimed a remote-controlled machine gun was used in a sophisticated ambush widely attributed to Israeli intelligence. Whether the operation involved remote weaponry or human agents remains contested, but its outcome was clear: Tehran lost the one man with the institutional memory, technical expertise, and command authority to push a covert bomb programme forward.

Or did it?

Rather than crumbling, Iran’s programme has pushed ahead. Enrichment at Fordow and Natanz has reached 60% purity. Ballistic missile tests continue. Following recent attacks on nuclear infrastructure and the suspension of IAEA inspections, Iran has taken a more assertive stance. Officials no longer deny their technical capacity, and IAEA Director Rafael Grossi recently confirmed that Iran possesses enough near-weapons-grade uranium to build multiple bombs.

While Iranian leaders stop short of declaring an intention to build a bomb, they are increasingly confident in signalling that they could—if they chose to. As Foreign Ministry spokesman Abbas Araqchi stated in May 2025, Iran ‘insists it has the capability but not the intention to develop nuclear weapons.’

Following Fakhrizadeh’s death, the Iranian regime elevated his status to that of a martyr, but notably did not name a successor. This silence is telling. Intelligence analysts suggest several possibilities: that the leadership of SPND has been deliberately decentralised to avoid creating another assassination target; that a senior IRGC figure has assumed control quietly; or that Iran’s military-scientific complex now functions as a dispersed network rather than a command pyramid.

Names occasionally surface in leaked reports or speculative briefings. Some point to Mohammad Mehdi Tehranchi, a nuclear physicist and academic with close IRGC ties, as a possible key figure. Others suggest an institutional shift where SPND’s functions have been redistributed among IRGC-controlled research centres.

What’s clear is that Iran’s core capacities — in neutron initiators, hydrodynamic testing, and miniaturised warhead design — were never dependent on one man alone. Fakhrizadeh was the architect, but not the builder.

Uranium enrichment dominates headlines, but the real signal of a weapons programme is work on weaponisation: designing the bomb, mastering detonation triggers, perfecting re-entry vehicles for missiles. These are the areas Fakhrizadeh was most involved in. And they are also the areas where Iran has been most secretive.

International inspectors have long been denied full access to military sites such as Parchin, where high-explosive testing is believed to have taken place. The IAEA’s latest quarterly reports highlight serious gaps in monitoring and verification. Meanwhile, Israel’s defence establishment continues to claim that weaponisation work is ongoing under new aliases and structures.

Olli Heinonen, former Deputy Director General of the IAEA, has repeatedly warned that Iran’s knowledge base remains intact and active. “The clock cannot be turned back,” he said in a 2023 briefing. “Assassinating Fakhrizadeh did not erase Iran’s nuclear memory.

As Western diplomats return to the table in Vienna or Geneva to revive the JCPOA or some replacement framework, they still focus overwhelmingly on enrichment levels, breakout times, and centrifuge models. But the ghost of Fakhrizadeh haunts these talks. The core infrastructure of Iran’s weapons programme — the personnel, the know-how, the intent — has survived.

Tehran now presents Fakhrizadeh as a national martyr, complete with memorials, medals, and a carefully managed mythology. His legacy is no longer deniable; it is instrumentalised. The regime wants the world to remember his name, just as Netanyahu once urged.

But the more urgent question is not who Fakhrizadeh was. It’s who took his place.

The truth is, Iran’s nuclear weapons potential has never depended on a single man. Fakhrizadeh’s assassination was a tactical success but a strategic pause at best. In the opaque world of Iranian military science, silence does not mean absence. It means someone else is building in the dark.

Fakhrizadeh is gone. But his ghost is very much alive.