Nope, not really- other than dog trainers. I have had lunch with Karen Pryor when she was in Denver, I know Leslie McDevitt and Suzanne Clothier pretty well, and I have had a few conversations with Ian Dunbar. I have also met Victoria Stillwell, but not enough to really "know" her.
Oh, I guess I sort of met Julia Roberts once. She came through my hometown, Carlsbad NM, on her way to somewhere. She was sitting a few tables down from us at a tiny little resteraunt, and my mom has her autograph somewhere but I was only 8 or something at the time so I didn't really know who she was that well.