Welcome to Atos Jiu-Jitsu Hamilton! We have been servicing Hamilton, ON and many surrounding areas such as Ancaster, Stoney Creek, Burlington and Brantford since 2009. At Atos Jiu Jitsu Hamilton, we are led by a team of fantastic instructors, who follow the teachings of multi-time World Brazilian Jiu-Jitsu Champions Rafael and Guilherme Mendes. The Mendes Brothers are responsible for creating a style of Jiu-Jitsu that has become known worldwide as “modern Jiu-Jitsu.” They continually create, develop and innovate techniques that have helped them to win multiple world titles. If you are looking to stay at the cutting edge of proven techniques and concepts, then look no further than Atos Jiu Jitsu Hamilton. We take great pride in following a structured BJJ system that focuses on your development while continually monitoring your progress. 

We have BJJ classes for everyone of all skill levels, as well as for ages as young as 4 and up! Brazilian Jiu-Jitsu is a contact sport and we provide a challenging yet safe environment for your child to mature into becoming a real-life champion on and off the mats. The discipline, focus and hard work expected by our instructors often carries over to the child’s behaviour at home and at school!

PJ O’Sullivan is the owner and Black Belt Professor at Atos Jiu Jitsu Hamilton. He earned his black belt in Brazilian Jiu-Jitsu in 2010. He has been teaching BJJ for over 15 years. PJ teaches a structured curriculum that engages and challenges students to continually improve their BJJ skills.


Together We Are Stronger.

The motto of Atos Jiu-Jitsu is "Together We Are Stronger." The Atos team has greatly influenced the way people across the world define and practice Brazilian Jiu-Jitsu.  Atos Jiu Jitsu has revolutionized how BJJ athletes drill and train Jiu Jitsu as well as evolving and innovating many positions such as 50/50 guard, leg drag, berimbolo and worm guard.  Atos was founded by Professor Andre Galvao and Professor Ramon Lemos.  It began as a small team that included our Professors Rafael and Guilherme Mendes, as well as many other Jiu Jitsu standouts such as Bruno Frazatto, Guto Campos, Claudio Calasans, Gilbert Burns, Rodrigo Caporal, Davi Ramos and Ary Farias.  Through their success, athletes from across the world have sought out the Atos Jiu-Jitsu style making it one of the most successful teams at the highest level of Brazilian Jiu-Jitsu Competition.  While its origins began in Brazil, the headquarters is now in San Diego, California. The team now has many more stars such as Keenan Cornelius, JT Torres, Rick Slomba, Michael Liera Jr, Mike Carbullido, Evan Esaki and many more!   Here at Atos Jiu Jitsu Hamilton we directly follow the leadership of Professors Rafael and Guilherme Mendes and maintain a strong relationship with their academy, the Art of Jiu Jitsu, in Costa Mesa, California.  


Our Lineage

Professor Ramon Lemos

Prof. Ramon Lemos is a co-founder of the famous Atos Jiu Jitsu Team, having formed some of today’s top BJJ fighters, competitors such as Guilherme and Rafael MendesGilbert BurnsRodrigo Caporal amongst others. Ramon Lemos has also been involved with the grappling training of top Mixed Martial Arts (MMA) fighters such as UFC Legends Anderson Silva and Rodrigo “Minotauro” Nogeuira.


Professor Andre Galvao

Prof. Galvao is a co-founder of the famous Atos Jiu Jitsu Team and he is a jiu-jitsu legend and mulitple-time world champion whom heads the Atos team at the Headquarters in San Diego. Originally from Brazil, Galvao moved to San Diego to open his academy and further grow the Atos team. Today you will find him on top of the podium of all the major tournaments or at the Atos HQ where he shares his love for jiu-jitsu with his students.

Professors Rafael and Guilherme Mendes

Professors Rafael and Guilherme Mendes are the backbone of the program at Pura BJJ | ATOS Hamilton.  The Mendes Brothers are responsible for creating a style which has become known worldwide as “modern Jiu-Jitsu.” They run a state-of -the-art facility in California that has influenced many gyms across the world!  We are very fortunate to learn directly from two of the best BJJ athletes and innovators of the sport!