About Leviathan Martial Arts
Instructors & Owners
Owner/Instructor: Eliseo G. Urbalejo
Owner/Instructor: Eliseo G. Urbalejo
Founded in 2020, Leviathan Martial Arts has been providing high-quality martial arts training to students of all ages and skill levels for over 4 years. Our experienced instructors are dedicated to helping each student reach their full potential and achieve their goals.
Owner/Instructor: Eliseo G. Urbalejo
Owner/Instructor: Eliseo G. Urbalejo
Owner/Instructor: Eliseo G. Urbalejo
Gabe Urbalejo is a life long martial artist, who has dedicated his life to empowering and better the people around him. "Being the change you want to see in the world starts with you and me" proficient in many style including TKD, BJJ & Krav. His true passion is the arts of Muay Thai and Traditional Northern Style Kung fu, which he compet
Gabe Urbalejo is a life long martial artist, who has dedicated his life to empowering and better the people around him. "Being the change you want to see in the world starts with you and me" proficient in many style including TKD, BJJ & Krav. His true passion is the arts of Muay Thai and Traditional Northern Style Kung fu, which he competes in both regularly. Currently:
4-1 Muay Thai
4-0 Sanda
Black sash Tai Ji Quan
Blue belt BJJ
Krav/MMA Blackbelt
6x Gold medalist in hand and weapon forms. He's always trying to reach higher levels in himself, so he can bring the best out of you.
Owner/Instructor: Sean M. Miller
Owner/Instructor: Eliseo G. Urbalejo
Owner/Instructor: Sean M. Miller
Sean Miller began his martial arts journey at twelve years old, a path that has shaped his life and values. Trained by Scott Aksamit, Sean has earned multiple ranks, including black belts in Shimsan and Kukkiwon Taekwondo, MMA (Krav/Muay Thai), and belts in Jiujitsu, Kempo Karate, and Judo. He also studied Krav Maga and MCMAP during his M
Sean Miller began his martial arts journey at twelve years old, a path that has shaped his life and values. Trained by Scott Aksamit, Sean has earned multiple ranks, including black belts in Shimsan and Kukkiwon Taekwondo, MMA (Krav/Muay Thai), and belts in Jiujitsu, Kempo Karate, and Judo. He also studied Krav Maga and MCMAP during his Marine Corps service, deepening his understanding of discipline and self-defense.
Sean’s journey as an instructor started at nineteen after a personal experience inspired him to help others feel safe and confident. Teaching for him is about more than techniques; it’s about building resilience and empowerment.
Now running his own MMA school in Englewood, CO, and working toward opening a Venture school in South Denver, Sean remains committed to sharing the life-changing benefits of martial arts with his community.
Instructor: Clairisse Major
Owner/Instructor: Eliseo G. Urbalejo
Owner/Instructor: Sean M. Miller
In 2020, Clairisse was like most of the world when the peak of the pandemic struck— without community, without a gym, and needing positive, lasting change. Knowing her friend Gabe practiced martial arts, she reached out to him, “I’ve done a little martial arts in the past, do you teach? I’m trying to get back into it.” They scheduled priv
In 2020, Clairisse was like most of the world when the peak of the pandemic struck— without community, without a gym, and needing positive, lasting change. Knowing her friend Gabe practiced martial arts, she reached out to him, “I’ve done a little martial arts in the past, do you teach? I’m trying to get back into it.” They scheduled private sessions at Cheesman Park downtown, and the rest was history. They had a few people signed up for outdoor classes already, thus creating the first generation Leviathan Martial Arts disciples.
Since then, Clairisse has dedicated herself to navigating the martial arts community to become the most well-rounded martial artist she can be:
- First degree black belt in MMA (Krav/Muay Thai)
- Amateur Muay Thai competitor (1-1)
- Four-time gold medalist competing Northern Shaolin Gong Fu.
In her spare time, Clairisse can be found living an active lifestyle with a focus to spread wellness to others. She is currently working on her degree in Integrative Health(RRCC), and her certification as an accredited Nutritionist and Personal Trainer (NASM).