- Sarunas Sulskis (Faced him round 1 of the 2003 US Open in Los Angeles)
- Irina Krush (In New York City at the Marshall Chess Club Summer 2015)
- Sergey Kudrin (Many times - He travels to weekend tournaments all thru the year and faced him in the North Carolina Open in 2011 I believe, if not, it was 2010 - doesn't wash his hands though when he uses the facilities)
- Melikset Kachiyan (2008 Western States Open, Round 4)
- Tatev Abrahamyan (WGM - Faced her Round 7 of the 2003 US Open in Los Angeles, 6 rounds after losing to Sarunas Sukskis - a draw and 4 wins the 5 rounds in between)
- Anatoly Karpov (Spoke at the 2012 National Open)
- Anatoli Lein (Faced in final round at 2014 Chicago Open)
Then, of course, I've ran into many lesser name GMs and probably a couple of others that I can't think of.
I've only gotten one autograph. GM Michael Rhode signed my Chess Life magazine (that had his picture on the cover), after I played him in a simul. He is not very famous though, as I don't believe he ever won a U.S. Championship or qualified for the Interzonals.