Natural Horsemanship is a way of working with horses. It' a human way to tell horse that you are his friend and that you wan't him to be partner with you. It's much easyer to work with horses, and much easyer to accomplish whatever you want...
Pat Parelli - one of my favorites
Silke Vallentin - I had an opportunity to wach her in Verona(Italy)
Alexander Nevzorov - my favorite
Monty Roberts - to me not so cogent