Apparently, Ralf Rangnick was one of the finalists for this job but Martinez beat him out.
Rangnick must sit around all day wondering what he has to do to get a job ahead of Martinez since this is the second time this has happened to him. I guess tactical nous doesn't count for much on the market.
Edit: I feel bad for Ralf because he kind of seems destined to be under-appreciated forever. He might not have gotten us in with Lukaku and Deulofeu, but I think he would have been a much better manager for us overall and he would have finally received some well-deserved appreciation outside of Germany.