Senior Grand Master Choi is one of the most influential Hapkido Instructors to Grand Master Tran. He is the one that taught Grand Master Tran special techniques in Qi-Gong and weapons.
- Certified 9th Dan Grand Master by International Hapkido Federation
- Founder of International Moo Gong Kwan Hapkido Federation
- Vice-Chairman of the International Hapkido Federation
- President of the Global Hapkido Association