Gabriel Martinez is a certified Mataas na Guro (Master Instructor) of the Pekiti-Tirsia Kali system and an Executive Director of the Pekiti-Tirsia Global Organization.  He is the owner and director of the flagship Pekiti-Tirsia school in the United States, the San Antonio Pitbulls. San Antonio, Texas.

Guro Martinez began his study of the Filipino martial arts during his service in the U.S. Air Force while stationed in the Republic of the Philippines from 1987 to 1991.  He received Instructor level certification in two Philippine martial arts before beginning his study of Pekiti-Tirsia in 1994.  He is a private student of the Supreme Grandmaster Grand Tuhon Gaje and Maginoo Timothy D. Waid and continues to receive private instruction in the advanced systems of Pekiti-Tirsia.  He is certified in the original systems of Doce Methodos and Contradas.

Guro Martinez is a certified Mataas Na Guro under Grand Tuhon Leo T, Gaje Jr.,  and Maginoo Tim Waid, of the Pekiti Tirsia Kali System. Specializing in Dumog/Pangamut(DUMPAG) Empty Hand, Combat Knife/Daga y Daga.

Guro Martinez is the recipient of the Bala-an Bukid Award for Exceptional Dedication and Loyalty to the Pekiti-Tirsia Kali system and is the first instructor of the Pekiti-Tirsia Kali Pitbulls groups.

He also holds a 2nd Degree Black Belt Chinese Kenpo Karate , National Chinese Kenpo Karate Association, San Antonio, Texas  under Sifu Gary Swan. 

First Degree black belts, in Kuntaw Arnis,   2nd Degree Black belt in Kuntaw under Guru Roberto Lao, Angeles, City, Philippines.