Professor at Harvard Grad School of Edu. Writes a lot of books. Wrote a good one called "frames of mind" concerning the Theory of Multiple Intelligences. This is not something like Schizophrenia, but the idea that we can be good at some things, ie spatial analysis, but awful at other things, like counting - maths. He manages to rationalise this whole IQ thing into the real world, where we have artists, mathematicians, programmers, receptionists, secretaries and Park Rangers.
The book has a leaf note review by Isaac Asimov!