CEO / Founder
Dr.
Tim Calvin
is the founder of Split-Second Response: Personal Protection and Security Training Services and the Conditioned Combat Response (CCR) Self-Defense System. Dr. ...
Director of Marketing and Sales
James (Jamie) Nelson has trained in martial arts for over 20 years. Jamie is a 3rd-degree Black Belt in our Conditioned Combat Response Self-Defense System and a 3rd-degree Black ...
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Director of Operations (Martial Arts Program)
Jarell Calvin is the Director of Operations and Master Instructor of our Martial Arts Department. Master Jarell has trained in martial arts for 26 years, and he has taught ...
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Director of Operations (Firearms Program)
Matthew (Matt) Carroll is the Director of Operations for our Firearms Program. Matt is a former police officer with the Oakland Housing Authority P.D. and Concord P.D. with over ...
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Black Belt Instructor
Simu Tiera Calvin is Master Tim's daughter and a 3rd-degree Black Belt. Simu Tiera has trained in martial arts for 14 years and is a Senior and Honor Roll student at Liberty High ...
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Assistant Instructor
Ron is the newest member of our martial arts instructional staff. Ron is one of our dads and is now a student at Split Second Response. He is currently working on earning his ...
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Best place ever!! Cannot say enough good things about these guys!! I highly recommend!
We signed our daughter up to D1 & Only Martial Arts after she was hit by another student at school. We wanted her to know how to be able to protect herself. We liked it so much that we enrolled all our kids. It has been a great experience for them all. They love coming to class and learning new skills and are also held accountable for their own behavior.
Great, friendly, and flexible staff. Master Tim and his family are awesome people and everyone I've met there have been nothing but kind. I would recommend this martial arts studio to anyone, especially beginners. I wish I had joined sooner.
