Just say that you did extensive research before you met him to see if he was the right fit. Which in this day and age, many people do that. Just be honest, or the session will get awkward fast, and he will pick up on it. You should be honest with your Ts and Pdocs if you want to get the best results.

I doubt he will think you are a stalker if you say it was a source from a work portfolio. I know on my Pdoc's page it states his birth year and his current age. And he knows that is public knowledge that anyone can find.