Matar, 27, can be seen in videos rushing the Chautauqua Institution's stage as Rushdie was being introduced to the audience for a talk about keeping writers safe from harm, some of which were shown to the jury during the three-week trial.
Rushdie, 77, was stabbed with a knife multiple times in the head, neck, torso and left hand, blinding his right eye and damaging his liver and intestines, requiring emergency surgery and months of recovery.
The writer was among the first to testify at the Chautauqua County Court in Mayville, calmly describing to jurors how he believed he was going to die and showing them his blinded eye by removing his adapted spectacles with a blacked-out right lens.
Matar was found guilty of attempted murder in the second degree and assault in the second degree for stabbing Henry Reese, the co-founder of Pittsburgh's City of Asylum, a non-profit group that helps exiled writers, who was conducting the talk with Rushdie that morning.
Rushdie, an atheist born into a Muslim Kashmiri family in India, has faced death threats since the 1988 publication of his novel The Satanic Verses, which Ayatollah Ruhollah Khomeini, then Iran's supreme leader, denounced as blasphemous.
After the knife assault, Matar told the New York Post that he had travelled from his home in New Jersey after seeing the Rushdie event advertised because he disliked the novelist, saying Rushdie had attacked Islam.
Matar, a dual citizen of his native US and Lebanon, said in the interview that he was surprised Rushdie had survived, the Post reported.
Matar did not testify at his trial.
His defence lawyers told jurors that the prosecutors had not proved beyond reasonable doubt the necessary criminal intent needed for a conviction of attempted murder.
Matar also faces federal charges brought by prosecutors in the US attorney's office in western New York, accusing him of attempting to murder Rushdie as an act of terrorism and of providing material support to the armed group Hezbollah in Lebanon, which the US has designated as a terrorist organisation.
Matar is due to face those charges at a separate trial in Buffalo.
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