Klaus Ferdinand Hempfling. He is a beautiful horseman, look for him on youtube, and I recommend his books.
To have that level of love and inner strength combined with gentleness, passion, devotion and then to have the ability to express it in writing is truly awesome. I also like that he has great respect for absolutely any horse, and never writes them off or even has favourites - he just loves horses. I also quite appreciate a person who is constant in their approach.
However, I also have great respect for Monty Roberts - he has truly changed the world of riding and training for the better, despite the odds. I've had the pleasure of meeting him, and have never met such a benevolent soul :) Kelly Marks is also fantastic, I admire her resolve on not using the whip in racing, and whilst I am not entirely sure on the inflexible approach of the Nezorov (I think that's right??) School of Classical Horsemanship, it has the horse's best interests at heart, and they are clearly excellent horsemen.
I was taught by a man named Shady a few years ago, and though I have sadly lost contact with him, I know that he trained with Uri Peleg in Israel. He was an amazing horseman, especially for everyday riding, as so much of his work was purely common sense, which some horse people seem to lack.
Dr Gerd Heuschmann (I think that's the right spelling??) Has also written some/an awesome book on classical dressage vs modern dressage. Whilst a bit sticky and factual to read, it's very good to know, and needs to be fought for in these days of impatience and economy. It also explains the importance of biomechanics, which some people forget. Also, kudos has to go to him for his immovable stance on the matter!!
So yeah.. that'd be my main list of peoples. There are obviously many many more, but those are all I can think of right now :) hope some of that is interesting or useful!
Just a note about the Parelli's though - I admire what they are trying to do with the whole "changing the world for horses and humans" thing, but I think it still needs to be developed into something slightly more.. erm.. pallitable, occasionally.
Oh, and Alois Podhajsky is awesome too - was director of the Spanish Riding School of Vienna. His book is well worth a squint :)
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