The phrase "assumed him" is not correct and does not convey a clear meaning in written English.
It may be intended to express a belief or presumption about someone, but it lacks clarity and context.
Example: "She assumed him to be the leader of the group, but she was mistaken."
Alternatives: "took him for" or "considered him to be".
Was Hobsbawm really the dangerous communist, the Stalinist apologist, the unrepentantly hardline Marxist that so many have assumed him to be?
Allan Bloom became famous not just because of what he wrote but also because of who people assumed him to be: antidrug, antisex, wildly patriotic.
Neither of the Schullers had ever heard of Philip Johnson, and at the time they assumed him to be a landscape architect.
This past year, researchers announced the results of full genome sequencing of the major players in this speciation event — and the discovery that the mysterious male was not who they'd originally assumed him to be.
When asked why he had continued for so long to give the impression that he had severe learning difficulties, he explained that, as they had assumed him to be incapable, he had given them exactly what they had expected.
This news came in the choppy wake of the revelation that the critic David Manning, of the Ridgefield Press — who, in the Sunday Times, had opined in an ad for "The Animal" that "the producing team of 'Big Daddy' has delivered another winner!" — was not the David Manning we had always assumed him to be; i.e., the George Jean Nathan of southwest Connecticut.
At once, we take Connie's side, assuming him to be his brother's keeper.
Though there is no hard evidence of David's presence, the context today fully assumes him.
It no longer strikes me -- and I assume him -- as such a swell idea.
He tells his family that if he hasn't returned within 10 days to assume him dead.
Others of my ilk, seeing the name transliterated as Kim Jong Il, assume him to be the son of Kim Jong I, which he is not.
