As a father, I applaud your intelligent caution, especially on the internet; would that most other kids have such sense.
I think if you want to verify that Harry here is really Harry Lang of Paramount, you can search the web to see that Paramount really has such a guy involved with their Star Trek franchise.
You could then find an official Paramount address for Mr. Lang and communicate with him that way... but it'll cost you a stamp. You may not have to pull your parents' teeth for one of those!