If you could create a traversable wormhole, then you could create a time machine, there's no doubt about it. But the question is: Can you create a traversable wormhole? And that all depends on having weird negative energy configurations. We simply don't know if that's possible. It's not ruled out, but I wouldn't bet on it. It's an open question for modern physics that people like me continue to work on every day.
The biggest question: Of all the TV series, which is your favorite?
The Next Generation is the best series overall, though I think some of the best individual episodes may have been in the first, classic series, if you suspend disbelief and take into account that the special effects were much worse.
If you had to pick just one, who is your favorite Trek character?
I always liked the science guys. So in some sense Spock was interesting in the first series, and I kind of like Data [the android from The Next Generation]. Data is probably my favorite character.