I have posted an article on Robert J. Sawyer, science fiction author, on the RFF Reflections blog. I invite you to read it. He writes exciting tales of aliens and of computer networks.
Of his books displayed on his website, these are the ones I want to read first.
. .. Then I would want to read Calculating God followed by Illegal Alien. Then I would want to finish the trilogies and maybe start on the Hominids series.
I suspect that the ones listed above will be suitable for teens. Far-Seer has been reviewed as a YA novel. Wake's main character is 15.
Check them out and tell me what you think.