Oscar Sensei
Counter Assault Tactical System Certified Instructor. (C.A.T.S.C.I.)
5th Dan black belt "Go-Dan".
SEI-SHIN-KAN BU-JUTSU
MIXED MARTIAL ARTIST
A Sensei (teacher) is not the one that has a lot of students, but the one who knows how to form a person.
-Hanshi 10 Dan Isao Ichikawa-
At the age of 6 Oscar Sensei started training with renowned senseis of the ancient martial arts. Among them:
KOBUDO, TEGUMI AND KARATE Hanshi Isao Ichikawa 10th Dan Red Belt. SEI-SHIN-KAN CATSYSTEM Hanshi Luis Zavalza Reyes 10th Dan Red Belt.Carlos Fernandez Contreras Sensei 3rd Dan Black belt. Alfredo Estrada Tavares Sensei 3rd Dan Black belt. JU-JUTSU AND CATCH-CAN-WRESTLING. Daniel Hernandez 8th Dan Black Belt. Hanshi Luis Zavala Reyes 10th Dan Red Belt. KENDO. Japanese Fencing Hanshi Matsunaga Masami. President of Japanese kendo Federation Sensei Adalberto Chavez. Mexico’s Kendo National Team Coach. AIKIDO. Shihan Masatake Fujita. 8th Dan Aikido Sensei Miguel Moreno. 6th Dan Aikido Trained by Sensei Ueshiba at Hombu Dojo in Japan. Achievements: December 17, 1989. After 12 years of training and at the age of 18 Oscar graduated as a Counter Assault Tactical System Certified Instructor Black Belt 1st Dan becoming the youngest Black Belt 1st Dan in the History of Sei-Shin-Kan in Mexico. Note: Sei-Shin-Kan do not give Black belts to minors, you must be at least 18 years old to hold a Black Belt. 
1990 Oscar graduated 1st Dan in the art of KENDO (Japanese fencing) and won 3rd Place for Mexico at the Pan-American Kendo Association games 
December 16, 1990 Oscar graduated as a 2nd Dan Counter Assault Tactical System Certified Instructor Black Belt
Oscar became the youngest instructor in charge of training Brown and Black Belts at the National Level for SEI-SHIN-KAN Mexico. Every Saturday all the Black belts and brown belts from all over the country would meet for training. Oscar Sensei would train all the brown belts for one year to make sure that no matter were they came from or from which instructor they were training under, all of them would have the same level and knowledge before they graduated as a Counter Assault Tactical System Certified Instructors black belt. It is still a tradition that on the second Sunday of December SEI-SHIN-KAN has the Black belt test, which ends the year's activities. 
Oscar Sensei would be in charge to teach the following concepts to the Black and Brown belts: 1.Tactical stand-up and submission ground fighting.
2. How to organize and choreograph a martial arts exhibition.
3. Tactical weapon fighting. (Knife fighting, gun fighting and impact weapon fighting)
4. Tactical Kettlebell circuits.
5. Underground training circuits.
6. MMA and Boxing tournaments
7. KYUSHO-JUTSU Tactical Vital Point Fighting.
Stomach Meridian. Striking stomach five (ST5).
8. ZA-ZEN (MEDITATION).
In 1992 Oscar Sensei received recognition for his sincere effort and dedication.
Below SEI-SHIN-KAN honors him with the 3rd Dan black belt San Dan at the age of 21.
On December 18, 2004 Oscar Sensei received the 4th Dan black belt at the age of 34.
Varsity Wrestling Coach assistance at HD Jacobs High School in Algonquin Illinois.
On August 27, 2007 Oscar Sensei received the 5th Dan black belt at the age of 36.
From 1990 to 1993 Oscar Sensei trained and graduated 3 generation of Black Belts.
Nearly 50 of his students graduated with honors having exceeded the minimum requirements.
Since July 2008 Oscar Sensei has been the head coach at MMA Underground.
Since 1989 when Oscar Sensei graduated as a C.A.T.S. certified instructor until today,
he has not stopped teaching and learning new concepts and ways of fighting.
He has continued to dedicate his life to the evolution and study of the mixed martial arts and and strength training.
Team Underground
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