This sounds ridiculous. In the writer's own words, "As a mathematician who studied at Berkeley, Harvard and Princeton, I’ve known geniuses". Maybe that's what she means by "geniuses", but usually the word tends to mean "who studied at Berkeley, Harvard and Princeton".
In terms of IQ, I think mathematicians are averaging something like +2 SD (>= 130). They are certainly "geniuses" (or "gifted"). But they themselves don't think they are geniuses, because by that word they mean +4 SD (>= 160) people.
In terms of IQ, I think mathematicians are averaging something like +2 SD (>= 130). They are certainly "geniuses" (or "gifted"). But they themselves don't think they are geniuses, because by that word they mean +4 SD (>= 160) people.