As to character, this is far more revealing than that sanctioned bio. I found the bio to be biased: the author never failed to use "genius" but as far for negative qualities, they were brushed aside.

Roughly 40 interviews in this pdf, from close associates, friends, classmates, co-workers, and industry colleagues. Not for profit; only meant to give an accurate depiction. And people seem to have been very honest also; maybe the interviewer being the FBI and probably confidentiality promised as well. I find roughly 60% of the people say he's morally and ethically questionable.