The part of a sentence "impact on him of" is correct and usable in written English.
You can use it when you want to express the influence of something on a particular person. For example: "The impact on him of the news of his father's death was devastating."
Like other leaders around the world, Syria's isolated president most likely spent the day after assessing the impact on him of the Republican's unexpected victory.
Just how the general's belated discovery of his roots in the shtetls of Eastern Europe affected him, just what was the impact on him of the racism of 1950's Arkansas and just why he (parenthetically) became a Roman Catholic in Vietnam are all matters that Clark chooses not to elucidate.
The aquarium had an exhibit featuring horseshoe crabs and Dr. Tanacredi speaks of the impact on him of the writings of the aquarium's director, the Dr. George Ruggieri, a marine biologist and a Catholic priest, he noted.
Ben had an intuitive understanding of the history of our profession, its formative impact on him and all of us.
"A prison sentence would have a severe impact on him," Persky said of Turner, who was convicted of three felonies.
It had a great impact on him, he said, talking of the random quickness of life, a new desire to be considerate.
The Russian president has had so many such moments, both publicly and in private sessions with both Russian and American officials, that Chechnya's impact on him has become an article of faith among Putin-watchers, both friendly and critical.
Despite prosecutors recommending six years in jail, Judge Aaron Persky (who like Turner was a Stanford athlete) opted to give Turner just six months behind bars because he felt "a prison sentence would have a severe of impact on him, and I don't think he'll be a danger to others". .
Leiter says that Berman's impact on him was "profound, and the concept of learning for the sake of learning has endured a lifetime".
He readily spoke of their impact on him.
It had a massive impact on him, helping him through the tragedy of 9/11 but also forcing him to question his motives and reassess.
