Najafi, a disarmament expert, previously headed the political and international affairs bureau at the foreign ministry after chairing the disarmament and international department there.
He will replace Ali Asghar Soltanieh, who announced his resignation on Thursday after serving more than a decade in Vienna, where the IAEA is based.
This comes as moderate President Hassan Rowhani continues to reshuffle his nuclear team, beginning with the appointment of ex-foreign minister Ali Akbar Salehi to head the country's Atomic Energy Organisation.
The IAEA says there is "overall, credible" evidence that until 2003 Iran conducted activities to develop nuclear weapons, despite Tehran's denials.
It has engaged in many talks with Iranian officials in the past two years but has failed to convince them to grant it access to sites, documents and scientists involved in these alleged efforts.
In parallel efforts, six world powers -- the US, China, Russia, France, Britain and Germany -- have tried to force Iran to cut back on its nuclear drive. They suspect Tehran is seeking to develop nuclear weapons, something it strongly denies.
Rowhani has promised to re-engage the world powers and increase transparency on Iran's nuclear drive.
You’ve reached your limit of {{free_limit}} free articles this month.
Subscribe now for unlimited access.
Already subscribed? Log in
Subscribe to read the full story →
Smart Quarterly
₹900
3 Months
₹300/Month
Smart Essential
₹2,700
1 Year
₹225/Month
Super Saver
₹3,900
2 Years
₹162/Month
Renews automatically, cancel anytime
Here’s what’s included in our digital subscription plans
Exclusive premium stories online
Over 30 premium stories daily, handpicked by our editors


Complimentary Access to The New York Times
News, Games, Cooking, Audio, Wirecutter & The Athletic
Business Standard Epaper
Digital replica of our daily newspaper — with options to read, save, and share


Curated Newsletters
Insights on markets, finance, politics, tech, and more delivered to your inbox
Market Analysis & Investment Insights
In-depth market analysis & insights with access to The Smart Investor


Archives
Repository of articles and publications dating back to 1997
Ad-free Reading
Uninterrupted reading experience with no advertisements


Seamless Access Across All Devices
Access Business Standard across devices — mobile, tablet, or PC, via web or app
