It is a shame to think that people might be aware of Dirac only through reference to Feynman, whose greatest works extended Dirac's own original breakthroughs. He has been rightly likened instead to Einstein for the brilliance and creativity of his contributions. Dirac created much of the foundations, modern formalisms, and mathematical tools of (especially relativistic) QM and also wrote the best textbook on the subject.

Both were pretty neurodivergent. Dirac had Autism and Feynman probably Autism + ADHD .