Mr. Hartman has been a personal student of Grand Master Remy Presas for over 16 years. He has been featured in multiple magazines including Black Belt and Filipino Martial Arts Magazine.

In addition to teaching in the United States, Mr. Hartman has taught in Canada, Germany, Denmark, Sweden, and England.

Mr. Hartman has been publicly endorsed by GM Presas as his number one black belt in the United States. When Grand Master Presas’ announced his retirement for medical reasons, Mr. Hartman formed the World Modern Arnis Alliance as a vehicle preserve the foundations of the art and share it with the next generation of students.

The World Modern Arnis Alliance's Board of Directors promoted Tim Hartman to 9th degree black belt on June 4th, 2005.