I actually come from a family of people who are all quite intelligent. Many of us were validictorians at our high schools, and most of us who went to college completed doctorates in our chosen fields. We had four children in our family, and we all "maxed out" the mini-IQ test that they gave at our elementary school. It was never necessary for us to do a full scale IQ test, but on the basis of the test in grade school, we are all above 135 IQ's. My brothers are both attorneys, my sister is a PharmD, and I am a family physician. My cousin, who is a self-proclaimed genius, and a proud member of Mensa was an art major. She went to a prestigious undergraduate universiy and graduate school at the Art Institute in Chicago. She never learned to drive, and never married. She designed displays for a major department store in Chicago, which I guess is a good situation for an art major.
I attended a very good public high school in the Chicago area, and there were also many gifted students at my high school, as well. The one classmate I had who I would label the most intelligent person I have known in terms of early achievement in math and science was a good friend of mine in early adulthood, while we were both in graduate school in Chemistry (not at the same university. She went to UC Berkeley, and I attended Ohio State University). She was kind of socially immature, actually, and ended up dropping out of graduate school after several years. I lost track of her until recently, and she finally completed her doctorate, although not from Berkeley.
As a graduate student, I probably associated with many people who were "geniuses" of various types. Some were successful and some less so. In my experience, people who were somewhat less gifted academically, but better developed in terms of "people skills" generally have been more successful in the long run. For example, my preceptor in graduate school was a prodigy. He finished his PhD in theoretical chemistry by the time he was 23 years old or so. But, his people skills are weak (I left his group to attend medical school), so, his success in guiding students through graduate school has been relatively poor. I think that in 30 years of professorship, he has had fewer than 10 students complete a PhD. In contrast, one of the best professors I have known, with excellent people skills (and about 10 years or so older than my preceptor), probably had 10 graduate students per year complete a PhD, most of whom have gone on to successful careers in chemistry. When I was in graduate school (this professor was at my undergraduate instituation), I had nominated him as a candidate for an award at my university, and the faculty had very disparaging comments to make about him, essentially saying that he wasn't the caliber of scientist that they wanted to speak. In my opinion, however, he has a wonderful legacy in terms of his research and the students over the years he has led to success in his field.