Hempfling is a rather interesting trainer (based in Denmark) who practices a unique style of training, although it is not entirely different from Natural Horsemanship. In his videos of ground work you can see his extensive use of body language - far more than most trainers use - such that he appears to "dance" with the horse.
He has an extensive collection of books and videos available, although I find the videos are not particularly methodical, in a way which might allow others to learn his methods simply. Rather they are intuitive, free-flowing, and beautiful, and thus quite a pleasure to watch. Here is one where you can really see how Hempfling uses his body to direct the horse while free-lunging.