Welcome to NJ RONIN

Jiu Jitsu and Striking Academy

Located at 119 Mountain Ct in Hackettstown, NJ

A Place For The Rest Of Us

to Grow.

the way of the ronin

NJ Ronin is a collection of new and seasoned  Jiu Jitsu practitioners, MMA fighters, boxers, and kick boxers who have been searching for the right training atmosphere. Ronin literally means, “he who drifts/wanders”. Ronins were made to feel like outsiders that didn’t belong. If you’ve ever felt like you didn’t fit in or just never really felt comfortable at a gym or another academy we would love to welcome you here with open arms. Come be a part of our family and wander no more!

Your Vibe will determine your


NJ Ronin is dedicated to creating a welcoming atmosphere for all visitors. Located in Hackettstown, NJ we are warren county’s newest academy specializing in Jiu Jitsu and Striking (Boxing and Kickboxing).We provide classes for the entire family 6 days a week. Private lessons and personal training are also available and can be scheduled around hours that work for you. Your first class is always free and beginner friendly. Come visit today to see the difference for yourself.

View the schedule

Work Hard



Our Jiu Jitsu classes are taught by highly qualified bjj practitioners with diverse backgrounds, techniques, and perspectives whose primary goal is to help you reach your full potential.

Children’s Jiu Jitsu

We offer childrens Jiu Jitsu 4 days a week! Ages 5 to 15 are welcome to come have fun being with a group of passionate bjj practitioners. Get your kids off their cell phones and onto the mats!


Home of the American Strikers, Coach Don and team focus on clean striking techniques that work for beginners and high level athletes. We have successfully worked with UFC, Bellator, and other top promotions.


Ronin Health and Fitness offers classes that will meet your schedule and pace! We use a mixture of kettlebells, battle ropes, and other equipment to make unique circuits that will get you results. Lose weight, get healthy, and have fun doing it. Give us a call today to try your first class for free.


A sport of unarmed combat derived from jujitsu and intended to train the body and mind. It involves using holds and leverage to unbalance the opponent.

  • "NJ Ronin is place that made me feel welcomed immediately."

    The instructors are amazing and are always encouraging everyone to ask questions. Definitely a place I can go to so that I can relieve any stress I had from the day. If you are hesitant about starting something new, whether it is Jiu Jitsu, striking, wrestling, or judo, definitely come in to watch. Danny is awesome and will let you try out what you want to learn so you can have a feel for it. I’ve been there for almost 6 months and I wish I did it way earlier!!!

    Andrew Papa
  • “Great results with a great group of people" If you're looking for great results with a great group of people, this is where you need to be! They offer classes for the entire family and are really dedicated to helping each member reach their goals.

    Robbyn Sue Araujo
  • An excellent place with outstanding people and fantastic instruction"

    NJ Ronin is an excellent place to not only learn martial arts but be apart of something greater than yourself. Everyone at NJ Ronin is very friendly, has no ego and is more than willing to help out as much as learn and grow themselves. If you're on the fence about where to train or even get a good workout just stop in and get a feel for yourself. It is an excellent place with outstanding people and fantastic instruction. I would recommend to anyone at any age looking to better themselves.

    Hayden Lechner


  • Aidan Phillips
    Aidan Phillips Coach

    Aidan is a no gi specialist who trains under the 10th Planet system. Aidan brings unique perspectives and submissions to the Ronin family every Wednesday night.

  • Dan Jantzen
    Dan Jantzen Coach

    Dan brings his passion for Jiu Jitsu Fundamentals every Monday. He is a student under Renzo Gracie Black Belt, Jamie Cruz (Cruz Control BJJ) and has been instructing children in Martial Arts since 2012. He is also the competition coach and has been actively competing in grappling competitions since 2011.

  • Don Cioffi
    Don Cioffi Coach

    Former professional and amateur boxer, former Golden Gloves, Diamond Gloves and Interstate Champion. Coach Don is the owner of American Strikers and is focused on developing well rounded strikers. He has been very successful helping many professional boxers, amateur boxers and MMA fighters achieve their goals.

  • Matt Nicolls
    Matt Nicolls Coach

    Matt has a passion for teaching, coaching and fitness. He has two years’ experience coaching children’s Jiu Jitsu classes, and one-year coaching fitness classes.He is always striving to increase his knowledge in the field and truly enjoys helping others achieve their goals.

  • Jamie Cruz
    Jamie Cruz Professor

    Jamie Cruz is a 3rd Degree Brazilian Jiu Jitsu black belt under Renzo Gracie, and is regarded as one of the top grappling instructors in the state of New Jersey – US, where he has trained some of the best jiu jitsu and mixed martial arts (MMA) competitors in the region. Jamie brings his high pressure system to the Ronins every Thursday at 7pm.

  • Eric Roncoroni
    Eric Roncoroni Coach

    Eric has been training since 2009. He mainly focused on BJJ from the start and then quickly transitioned into becoming an MMA striker. He’s fought for some of the best east coast regional MMA promotions such as Cage fury fighting championship, Ring of combat, Art of War and many others. He won his first Belt as an ameatur but then went on to become the Ring of Combat Champion at middleweight!

  • Bill Gresham
    Bill Gresham Judo




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