Mr. Samuel Myat San is the trainer for the HMUN pre-MUN briefing.  He was captain of the Anglo-Chinese Junior College (ACJC) Debate Team and the Singapore National Debate Team. He was also the Vice-President of the Harvard University Speech and Parliamentary Debate Society, a tenure that focused on training new Harvard debaters and judges for the Harvard University Debate Tournament. 

After college, he turned to coaching teams in Singapore such as ACJC and Nanyang Girls High School. In recent times, he has focused his attention on developing debate teams and oratory programmes in schools without a tradition of English debate, such as Dunman High School, Chung Cheng High School (Yishun), Kuo Chuan Presbyterian Secondary School, and Evergreen Secondary School.

After a stint in the Singapore Civil Service with the Ministry of Defence, Ministry of Foreign Affairs, and the Ministry of Law, he is now a full-time debate coach.