If you want it to mean that Mr. Parker is still in Tokyo, you want to say:
"Mr. Parker has gone to Tokyo."
"been to someplace" means you went there in the past,
"gone to someplace" means someone (not you) went there, still there, so not here.
another related and useful expression is "been there, done that!", which means I've been there (or in that situation) and I've done that (or experienced that) so I know about it, it's nothing new, that sort of thing.
I hope it helped. Best wishes!