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
Focused on fundamentals and technical growth.
John Vitellaro
Professor
Blends tradition with modern jiu-jitsu insight.
Matthew Tufele
Coach
Motivates with energy, discipline, and heart.
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.