Who is the best person to learn HDR photography from?
That all depends on you. Search around at all the instructors that are offering seminars and training on the topic and check out their HDR work. When you find one of them that has a lot of images that you like and you like their style of teaching, sign up for their seminars. I originally learned about HDR photography from Ben Willmore at a Photoshop World conference. He is an amazing artist, a darn good instructor, and a really cool guy. His latest book on HDR photography is available for on Amazon. He also has a DVD set on HDR photography that you can purchase for $69.00 HERE. I am also putting together a video training DVD on HDR photography but I do not have an available date for it yet as it is a slow moving process.