He specialized in neutron transport, a phenomenon that lies at the heart of nuclear chain reactions in reactors and bombs. According to The Guardian, he "had no known links to banned nuclear work". According to Al Jazeera he "was a quantum physicist and was not a political figure at all" and he "was not involved in Iran's nuclear programme".
He was also alledgedly Iran's "top Stuxnet expert". According to Time magazine, Majid Shahriari was "the top scientist and senior manager of Iran's nuclear program". Some Iranian media reports said he taught at the Supreme National Defense University, which is run by the Iranian Army, according to the New York Times.
Shahriari published dozens of esoteric conference reports and peer-reviewed articles on nuclear research. On 29 November 2010, unidentified assailants riding motorcycles launched separate bomb attacks, killing Shahriari and injuring nuclear scientist Fereydoon Abbasi, a professor at Shahid Beheshti University where Shahriari also taught. Dr. Abbasi's wife was also hurt.
The killers had attached bombs to the professors' cars and detonated them from a distance. Iranian officials have variously blamed Israel and the United States for assassinating Shahriari. Saeed Jalili, Iran's chief nuclear negotiator, was quoted as saying Western nations "exercise terrorism to liquidate Iran's nuclear scientists".
Time magazine ran an article questioning whether this action was perpetrated by Mossad (Israel's external intelligence service). According to The Daily Telegraph (UK), Israel allegedly planned to conduct covert operations against Iran, including assassinations. Tehran nuclear site was officially renamed after him after his assassination.