Tom Clancy is the well - known author who created the John Clark novels. His works are famous for their detailed descriptions of military operations, political scenarios, and complex characters like John Clark.
Since we only have the name 'john long stories', it's tough to figure out the author. It might be a relatively unknown author named John Long who is just starting out in the writing world. Or perhaps it's a local author who has written these stories for a particular community or audience. Another possibility is that it's an older collection of stories and the author is no longer actively promoting them, which is why there's not much information available.
Niven's science fiction often features highly imaginative and complex alien species. For example, in his Known Space series, he created unique alien physiologies and cultures that added depth to his universe.
One of the best is 'Ringworld'. It features a huge, artificial ring-shaped world orbiting a star. The concept is mind - boggling and the story is filled with adventure and interesting alien species.