[Greg Egan][1] is a science-fiction writer that holds a B.S. in Mathematics (and a paper with John Baez). He often manages to insert some advanced maths, physics and computer science content in his novels (for instance, listing only mathematics, fiber bundles in *Diaspora*, Einstein's equation for general relativity in *Incandescence*, Cantor sets and commutative diagrams in two short stories whose title I have forgotten).

On the top of my head, I find it difficult to name a novel of his that does *not* feature a scientist among the protagonists.

  [1]: https://en.wikipedia.org/wiki/Greg_Egan

ADDED by AK: His story "Dark Integers" deserves special mention (ADDED by DR: and is a sequel to "Luminous", best read in order).