I am asking this question for an older relative. This story sticks out to them over four decades after reading it, but they can't remember the title.
The story is about an extremely intelligent man who is put into suspended animation and is woken up when a really complex problem needs to be solved. He is then put back into suspended animation until a new problem arises. The story was likely published before 1980 (my relative believes they read it in 1978 or 1979). They also thought it was published by Ray Bradbury, but that may or may not be the case.
I don't know if it was a short story or a novel.
The only other piece of information I can give is that they think there was a character named Nagha (I don't know if that's the correct spelling).
Searching the internet with just these parameters has not worked.