Parker Self Defense

Instructors and Staff

Our Black Belt Motto "Iron Sharpens Iron" As one person sharpens another

Our Black Belt Motto “Iron Sharpens Iron” As one person sharpens another, we believe that as Black Belts we a servant leader, one who seeks to invest himself in the lives of the students so that, and in return the community is challenged so all may grow.

Gene Twombly

As a survivor of domestic violence, Gene has a heart for people that suffer violence-based trauma, His story about how God used martial arts to empower him to overcome his past and heal his mind, heart and soul is the very foundation that created the mission behind our non-profit. “Empower others to have the Courage to stand for themselves, the Compassion to Care for others, even those that mean them harm, and the Confidence to believe in themselves no matter what the conflict.”​With over 39 years of experience in several martial arts, Gene has gained the knowledge to hold 4 separate black belt ranks, Traditional Jujitsu (5th), Judo (5th), Taiho-jutsu (arresting art) (1st), Jujitsu 360 (5th), and a Level 1 in Krav Maga, Krav Maga Alliance, and is a Certified Senior Instructor with the USJJF. It is this combination that qualifies Gene to navigate our leadership at Parker Self Defense as It's Head Instructor.

Jeremy Morris

Current ranks Jeremy holds 3rd Dan in Jujitsu 360 Self Defense System, 3rd Dan in US Ju-Jitsu, 2nd Dan in Karate/ Taekwondo , 3rd Dan in Traditional Kodokan Judo,, 1st Dan in Taiho Jutsu, ​ At just 3 years old Sensei Jeremy began his journey into martial arts through Tae Kwon Do and Karate. Under the instruction of Sensei Bob Davis, Sensei Jeremy would spend the next 15 years fine tuning his skills and knowledge. In 2007, Sensei Jeremy discovered a new passion and has spent the last 10 years developing his judo and ju-jitsu skills, under the mentorship of Sensei W. Dieter Reitzig It was Sensei Jeremy’s expertise in the striking arts and Kobudo weapons that has made it possible for him to help develop the Jiu Jutsu 360 Complete Defense System.

Chris Rodriguez

Coach “Judo Chris” Rodriguez began his studies in 2015 in judo, shortly thereafter he found a real passion for the striking element of the 360 JiuJutsu program, he currently holds a Brown Belt and with his strong desire to help others he has been a real asset to the program.

Desirae Twombly
​Mr. Robert Koski

​Mr. Robert Koski is the only Krav Maga instructor in Southern Colorado to have trained in Israel at the prestigious, invitation-only Wingate Academy. He is certified through Wingate to instruct Krav Maga. He is also the head instructor of the USA-Jujitsu, LLC Judo Ju-Jitsu program. He holds 3rd degree Black-belts in Taiho Jutsu and 3rd degree USA Ju-Jitsu, as well as 1st degree in Yoshin Ryu Ju-Jitsu and 3rd degree in USTKJ Judo. Robert also trains in Machado BJJ and currently holds a purple belt.

W. Dieter Reitzig Retired

6th Dan in United States Ju-Jitsu, USJJF, 6th Dan in Kodokan Judo, USA-TKJ, 6th Dan in 360 Self Defense System, 1st Dan in Taiho Jutsu, USJJF, Sr. Technical Adviser Colorado and Regional USJJF, Senior 2nd Level Instructor – Examiner, Head Instructor for Judo and Ju-Jitsu Omega Martial Arts, 2000 – 2010.
Head Instructor Dragon Heart Martial Arts LLC, 2011 to 2015
Retired Sensei Dieter began his studies in 1949, under Sensei Ludwig Prass, at the Duesseldorfer Judo Sportschule (Germany). It was Sensei Dieter’s technical guidance and his Jiu Jitsu knowledge in the areas of maximum efficiency and realistic defensive situations that laid the groundwork for the Ju No Kihon text book which is the very foundation of the Jiu Jitsu 360 system.
​ USJJF BIO Learn more about Ludwig Prass’ history by visiting the Sportschule

Address15334 E Hinsdale Cir STE 1B, Parker, CO 80112

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