PGA Champ Martin Kaymer has many apparent TGM Elements in his swing. Great right forearm tracing. He also has a beautiful left forearm swivel at the end of the follow through (and has a very centered position at the top ala Heath Slocum.
I believe it is Pete Cowen. You know, the same guy who works with Luis Oosthuizen, Paul Casey, Henrik stenson, Graeme McDowell, Lee Westwood.... and many others. He seems to be the top coach in the world if you look at major winners and the top finishers in them.