Jiu-Jitsu is the art and science of control (immobilization),
that leads to submission (joint locks / choke holds) of your opponent.

We teach the techniques, systems, and overarching principles that encompass the grappling art of Jiu-Jitsu.
Our environment is safe but challenging, fun but disciplined, one of individuals forged by a team who want you at your best.
This craft empowers us with the tools to master our mental, physical, and emotional state through consistent work.
We problem solve under stress. We practice humility. We accomplish mastery together.
Welcome to the art that has transformed millions of lives.
Welcome, to the Theory Jiu-Jitsu Studio.


Innovative Process

Our goal at Theory Jiu-Jitsu is to consistently strive for the horizon of innovation, meaning we are not shackled to traditional mindsets and are free to seek the truths of Jiu-Jitsu efficacy. 

Inquiring Mindsets

Our instructors act as “moderators” in classes, promoting the examination of techniques and encouraging students to analyze content and seek new ways to streamline the process.  

Inclusive Environment

We pride ourselves in nurturing a training environment where students of all backgrounds and skill levels are able to work productively with each other to accomplish their training goals. 


Organized Curriculum

You will be provided with technique and skill guidelines to advance to your next rank, along with the training and resources necessary to reach them, never lost on what their goals are.

World-Class Content

Our focus is of building a world class games.
We keep up with what works at the highest level, and ensure that our students have the framework to excel on whatever platform they choose.

Multi-Discipline Focus

We integrate all forms of grappling into our training, varying from Judo, Sambo, Wrestling, Catch Wrestling, and Folkstyle Wrestling to ensure maximum submission grappling proficiency. 



Our head instructor, Levi has over 18 years training in martial arts, having achieved
the rank of 3rd Degree Black Belt in American Freestyle Karate and Brown Belt in Gracie Brazilian Jiu-Jitsu.

His determination to bring Jiu-Jitsu and its life-changing effects to as many people as possible
drives him to help create a thriving environment for everyone at Theory Jiu-Jitsu!


His inspiring videos on YouTube have educated people around the world, in addition to his complete instructional library, “The Collection“.

Roy Dean’s martial education is well rounded, holding first degree black belts in Kodokan Judo and Aikikai Aikido, and third degree black belts in Japanese and Brazilian Jiu JitsuHe continues to be a student of Roy Harris, and is recognized as a black belt by the International Brazilian Jiu Jitsu Federation (IBJJF), with affiliated academies around the world.

He has written about his adventures in two books, “The Martial Apprentice” and “Becoming the Black Belt.”

We are very proud to be Roy Dean’s FIRST and ONLY affiliation in Wisconsin!