Pro Players you have been at a Table With?

How do you know if you're playing a pro or just a "fan" using their name? Do they actually use their real names? I've seen a lot of "famous names" on line but I don't believe it's really them. Or is it?

A Team Poker Stars Pro has a red Poker Stars symbol near their name like in the pic below.

And as far as I know Full Tilt Pro's have an avatar that looks like them. I.E. not one of the normal avatars.

Live, I played just less than a full day of the 2008 Irish Open with Christer Johanson (sp?) who won it in 2009 and also has a WPT or EPT win to his credit. The main thing I noticed was that he was active opening pots, especially in late position, and even more so after that helped him to accumulate a good-sized stack.

Doyle Brunson was the big name in that tournament. I didn't get to play with him, but saw him a fair bit, both at and away from the tables. What stood out for me was his gentlemanly demeanor, even when people would butt into his conversations to ask for autographs, photos and handshakes, which happened a lot.

Played in a 35K Guarentee with Lee Watkinson once. Didnt play many hands until I was moved to another table.