Dr. Artour Rakhimov has been teaching the Buteyko breathing method since 2001 and trained Buteyko practitioners and teachers of the NormalBreathing method.
Read more about Dr. Artour Rakhimov on his Amazon author page:
https://www.amazon.com/Artour-Rakhimov/e/B007A0ZE4K
See Dr. Artour Rakhimov in over 100 videos of his YouTube channel: