About

A serious dojo, in the truest sense

Kanzen Karate School teaches Kanzen Goju-Ryu — traditional karate, in Marlboro, NJ. We are not a sport and we are not a daycare. We teach real karate, with the discipline and respect the art demands.

Our story

Kanzen Goju-Ryu was built by the late Zokucho (Grand Patriarch) Harry Rosenstein, who taught from 1974 onward and upheld its standards for decades. The art he passed down traces back to the founders of Goju-Ryu.

Today his student, Shihan Donny Sheinwald, leads the school — preserving the same curriculum, the same protocol, and the same respect for the art. Some things are worth doing exactly as they were meant to be done.

The late Zokucho Harry Rosenstein, founder of Kanzen Goju-Ryu

What we stand for

Our values

Tradition

We teach classical Kanzen Goju-Ryu the way it was meant to be taught — kata, protocol, and etiquette intact.

Discipline

Students stand in stance, stay focused, and earn every step. Consistent effort, class after class, is how real progress is made.

Respect

Respect for the instructors, for training partners, and for oneself. It begins on the mat and carries into every part of life.

Self-Defense

Practical, traditional technique with full controlled sparring. Students learn to genuinely defend themselves — responsibly.

Confidence

Confidence here is built, not handed out. It comes from doing hard things well, again and again.

Focus

The clarity and inner drive students build at Kanzen show up in school, at work, and at home.

The instructors

Trained by experts, with decades in the making

Shihan Donny Sheinwald

Ro Dan · 6th-Degree Black Belt · 42 years

Head instructor of Kanzen Karate School. A student of the late Zokucho Harry Rosenstein, Shihan Sheinwald carries the tradition forward today. He completed a 100-man kumite — sparring one hundred opponents in a row — one of only two karateka recorded to have done so.

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Shihan James Walsh

Ro Dan · 6th-Degree Black Belt · 42 years

Four decades on the mat. A senior instructor whose depth of experience anchors the dojo's standards and the quality of instruction every student receives.

Renshi Eddie Gullod

Yo Dan · 4th-Degree Black Belt · 35 years

Thirty-five years of training and teaching. Renshi Gullod brings patience and precision to students at every level, from first-day beginners to advanced ranks.

1974

Teaching since

5.0★

Across 20+ Google reviews

100

Man kumite, on record

Come see for yourself

Watch a class, or step on the mat with a free trial lesson. Total beginners are always welcome.

Claim Your Free Trial Lesson

"It's a traditional Goju Ryu karate school that teaches you the classic techniques while practicing contact sparring safely. The instructors have been training here for decades and are passionate about every student. I've built strength, stamina, flexibility, memory, and self-discipline here — and it's paid off in every part of my life."

— Tanay Gavankar, Student since 2001

"Kanzen changed the whole direction of my life. I went from a 20-year-old with no direction to a successful attorney running my own law firm for 23 years. At 60, I'm still training — applying the principles of classical karate to everyday life, whether work, family, or friends. The more you put into it, the more you get out of it."

— Keith Leshine, Student since age 20

"The instruction here has literally turned my life around. With the tough-love of Shihan Sheinwald and all the instructors, I have a new lease on life. I hold my head high, with confidence and discipline in every part of my life."

— Scott Shore, Adult student, Marlboro

"The instructors are incredibly patient, disciplined, and supportive. We've seen such a positive change in our son's confidence, focus, and respect both on and off the mat. The environment is welcoming, motivating, and feels like a true family."

— Mario Porr, Parent

"If you're looking for a karate place for your child (or yourself) this is the real deal! 30 years ago I took classes at Kanzen and got my Black Belt. It gave me self-confidence, got me in shape and created a strong foundation for the rest of my life. Now my 12-year-old son and I train together — and it was still less than what I was paying elsewhere for just one child."

— Richard G., Parent & former student

"While learning the comprehensive karate curriculum and strengthening my 73 year old body, I enjoy the feeling of clearing my mind of everything else for those few hours. The instructors are knowledgeable and passionate about maintaining the legacy of traditional martial arts."

— Jack Fajerman, Adult student

"I have been with Kanzen Goju Ryu for 24 years, since I am 4 years old. I credit Kanzen for me being where I am today. It has instilled in me focus, confidence, discipline, among many other traits. I highly recommend for all ages."

— Justin Sheinwald, Student for 24 years

"I have known Donny for years and can confidently say he's one of the most hard working, dedicated people I know. I joke with him by calling him a ninja because of how highly skilled he is in martial arts. Anyone learning from him is in great hands."

— Eric Sandowsky

"Kanzen Gojuryu is a life changing karate dojo that doesn't just improve yourself in self defense, but in so many other aspects in life even outside of the dojo. The sensei's at the dojo have dedicated their lives to karate."

— Richard Garrell, Student

"From the beginning Kanzen Goju makes sure you learn the proper ways and techniques to use in your own way. I would highly recommend to anyone who wants to study under the best sensei I have had the opportunity to be a part of."

— Rich Kallman, Student