INSTRUCTORS
ROBERTO KAELIN
BJJ Black Belt | Judo Black Belt | Karate Black belt
Welcome to the team! At age 18, I started training with World-Famous Brazilian Jiu-Jitsu Instructor, Carlos Machado. I earned my Black Belt in 2005 and opened Keller's first Brazilian Jiu Jitsu academy in 2007.
I've trained hundreds of students who have improved their lives, earned black belts, opened their own academies, & have become IBJJF & Tournament Champions! I look forward to meeting you & having you on the team!
BJJ Black Belt | 4th Degree | Under Carlos Machado
Judo Black Belt | 1st Degree | Under Vince Tamura
Karate Black Belt | 1st degree | Under Wayo Salas
3-0 Vale Tudo Record
TRACY D'ARCY
BJJ Black Belt | Judo Brown Belt
Tracy is Viper BJJ's office manager, head kids class instructor, & women's team instructor. Her philosophy is to run the academy with honesty, integrity, & hard work. Tracy's passion is teaching & making Brazilian Jiu-Jitsu easy for everyone to learn!
BJJ Black Belt | 3rd Degree | Under Roberto Kaelin
Judo Brown Belt | Under Dwan Stregles
TREY PEERY
BJJ Black Belt
Trey Peery is a Brazilian Jiu-Jitsu Black Belt under Roberto Kaelin. Since 2020, Trey has led our morning classes, growing attendance from a single student to a strong, consistent team. His teaching style emphasizes technical basics & he adapts to the needs of each student, fostering personal skill development in a supportive environment. Trey is passionate about helping others progress & tailoring training so every practitioner finds their path in Brazilian Jiu-Jitsu!
DWAN STREGLES
Judo Red-White Belt | BJJ Black Belt
Dwan is a 6th Degree in Judo & leads our Adult Judo program. He is a multiple-time Texas State Judo Champion, 2x National Judo Champion, & also holds a Black Belt in Brazilian Jiu-Jitsu.
WESLEE PARKER
BJJ Purple Belt
Weslee is an active competitor & kids competition team instructor. At Blue Belt, he won gold at every local tournament, plus silver at IBJJF Pans & Master Worlds in 2025. He was promoted to Purple Belt in September 2025 & won the AGF Purple Belt Master division that same month. In 2026, he placed 2nd at IBJJF Europeans M1 after only 4 months at Purple Belt!
BAILEY PARKER
BJJ Blue Belt
Bailey is an active competitor & kids class assistant instructor. She is the 2025 & 2026 IBJJF Dallas M1 Blue Belt Champion & 2026 IBJJF European M1 Blue Belt Champion!
NICHOLAS HALL
BJJ Blue Belt
Nick loves to teach, learn, & compete!
Some of his big wins include gold medals at:
NAGA | 2022 | 2023 | 2024
JJWL | 2023 | 2024 | 2026
AGF | 2023 | 2025
DARION JACKSON
BJJ Brown Belt
Darion is our Kids & Teens MMA instructor. He is an active competitor in several martial arts including Brazilian Jiu-Jitsu, MMA, & Muay Thai Kickboxing.
Darion recently won his December 2025 MMA fight in 43 seconds via body kick!