Meet the Team Behind Your Progress
The instructors at ATOS Jiu-Jitsu Las Vegas bring professionalism, experience, and dedication to every class, fostering an encouraging environment where every student can thrive. With a strong focus on mentorship and guidance, the team ensures that each individual receives the support they need to succeed both on and off the mat.
Our Team
James Nival
Head Professor
Second Degree Black Belt under Andre Galvao. James has been training in the art of Jiu-Jitsu since 2006. Having trained in Las Vegas and Rio de Janeiro. James is an avid competitor and the head instructor at Atos Las Vegas Academy.
Mitchell L. Bowles II
Professor
KANSAS Jayhawks alumni and Division 1 football player from 95’ to 00’ and is currently a 1st-degree black belt in Jiu-Jitsu. Mitchell started training in November of 2009 and has never stopped; he loves working with kids and adults, passing on the knowledge of self and discipline. He is a constant student and practitioner of the art.
Shane Koehler
Professor
1st Degree Black Belt under Professor James Nival
Professor Shane began his Jiu-Jitsu journey in 2016. After his very first class, he was instantly hooked and quickly committed to training daily. Throughout his progression through the color belts, he earned multiple podium finishes, reflecting his dedication and competitive spirit.
In 2021, after receiving his black belt, Professor Shane transitioned into a teaching role, where he discovered a deep passion for coaching and mentoring others. Now a 1st degree black belt under Professor James Nival, he is focused on student growth, technical development, and fostering a strong, supportive team environment.
John Vitellaro
Professor
Professor John Vitellaro is a black belt adult fundamentals, advanced (gi/no-gi) instructor. He strongly believes jiu-jitsu is an exemplary pathway to growth and purposeful meaning. Having trained since 2010 across the U.S. while serving in the U.S. Army, ultimately honorably retiring from the Army and settling in Las Vegas where he received his black belt under Professor James Nival. John’s goal is to provide purpose, direction, and motivation, encouraging each student to reach their potential on the mat. John is proud and thankful to be a part of and shoulder responsibilities at Team Atos LV. He’s eager to roll and share his knowledge any time.
Matthew Tufele
Coach
With 9 years of dedicated training, Coach Matt is currently a brown belt in Brazilian Jiu Jitsu and a proud coach committed to the growth and success of my students. My journey began at the Blue Diamond location under the guidance of Professor James, where I developed both my skills and my love for the art.
Three years into training, I found a new passion—teaching. I began working with kids, and over time, that role evolved into becoming a full-fledged coach for both children and adults. Sharing the knowledge I’ve gained and helping others discover their potential has become the heart of my mission.
I believe that jiu jitsu is more than just a martial art—it’s a path to personal growth, confidence, and discipline. My goal is to help every student succeed, not only on the mats but in life as well.
Camille De Keyser
Coach
Inspires confidence through skill and focus.
Natalia Nival
Professor
Natalia Nival is a Brazilian Jiu-Jitsu Black Belt under her husband, Professor James Nival, at Atos Jiu-Jitsu Las Vegas, with over 11 years of training. A former Division I and semi-professional soccer player, she is a World Master Champion at blue belt and a consistent podium finisher at prestigious events including the IBJJF Pan Ams No-Gi, Worlds No-Gi, and American Nationals. In addition to raising three children, Natalia serves as Assistant Principal at a K–12 charter school while earning her Doctorate in Educational Leadership. Her guiding philosophy—“Perseverance transforms challenge into strength”—shapes both her personal life and the leadership she brings to the academy.
Train With the Best
When you train with experienced instructors who care about your growth, every session becomes a step forward. Connect with ATOS Jiu-Jitsu Las Vegas to meet the team behind the training and find out how we can help you push your boundaries and achieve more.