Forum: Story Recommendations

Please recommend your favorite stories where the protagonist is primarily the 'idea guy' and provides guidance to the scientists or artisans of (whatever) era the story is set in.

I nominate the various stories of https://storiesonline.net/a/ScotlandtheBrave

SmokinDriver has 2 series

Hindsight 20/20

and

Nick, High School

One of John Wales do over stories has that, I think it's Rebirth