Chairman of the Department of Anatomy and is the former Dean of the faculty of Medicine, University of Chiang Mai, Chiang Mai, Thailand.

Professor Tejasen studied various articles concerning the Qur'an and modern embryology. He spent four days with several scholars, Muslims and non-Muslims, discussing this phenomenon in the Qur'an and Hadith. During the 8th Saudi Medical Conference in Riyadh, Saudi Arabia he stood up and said:

"In the last three years, I became interested in the Qur'an... From my studies and what I have learned throughout this conference, I believe that everything that has been recorded in the Qur'an fourteen hundred years ago must be the truth, that can be proved by the scientific means.

Since the Prophet Muhammad could neither read nor write, Muhammad must be a Messenger who relayed this truth which was revealed to him as an enlightenment by the one who is eligible creator. This creator must be God, or Allah.

I think this is the time to say La ilaha illa Allah, there is no god to worship except Allah (God), Muhammad rasoolu Allah, Muhammad is Messenger of Allah...

The most precious thing I have gained from coming to this conference is La ilaha illa Allah, and to have become Muslim."