One of my favorite photographs. It captures their characters so well.

The Strangest Man: The Hidden Life of Paul Dirac, Quantum Genius - https://en.wikipedia.org/wiki/The_Strangest_Man

Paul Dirac Quotes - https://en.wikiquote.org/wiki/Paul_Dirac

Read his lecture/essay; The Relation between Mathematics and Physics by Paul Dirac - https://www.damtp.cam.ac.uk/events/strings02/dirac/speach.ht...

Wikipedia also has a nice general overview; Relationship between Mathematics and Physics - https://en.wikipedia.org/wiki/Relationship_between_mathemati...