At Cherry Hill Academy of Martial Arts (CHAMA), we believe martial arts is more than physical training—it’s a lifelong journey of discipline, growth, and transformation. Under the leadership of Master Joseph Mertz, our students not only learn effective self-defense skills but also develop confidence, character, and a strong sense of community.

About Master Joseph Mertz

Master Joseph Mertz began his martial arts journey in August 2006 at the age of 39. Defying expectations, he earned his first black belt in Taekwon-Do just three years later, on October 18, 2009. Since then, his passion has only grown, leading to advanced training, instructional roles, and leadership across multiple martial arts disciplines.

Black Belt Ranks Held:

• 5th Dan, Kido Kwan (ITF Taekwon-Do) – Certified #5-70-3103

• 5th Dan, Chung Do Kwan (WTF Taekwondo) – Certified #5-5514

• 1st Dan, Moo Duk Kwan (International Tang Soo Do) – Certified #18174-190

In 2014, Master Mertz earned his black belt in Tang Soo Do through the Global Korean Martial Arts Federation. He achieved his 4th Dan in Taekwon-Do in May 2017 and 5th Dan in 2020. Appointed Chief Instructor of Cherry Hill Martial Arts in January 2016, he later founded Cherry Hill Academy of Martial Arts in May 2025, where he continues to teach, mentor, and inspire.

Recognitions and Affiliations

Master Mertz’s excellence has been recognized by numerous organizations:

• Acton Martial Arts Hall of Fame – Excellence in Teaching (2016), Esteemed Modern Warrior (2018)

• USA Martial Arts Hall of Fame – Most Inspirational Black Belt (2015), Instructor of the Year (2016 & 2017), Master of the Year (2018)

• Legends of the Martial Arts Hall of Fame – Instructor of the Year (2015 & 2016)

• California Legends Hall of Fame – Master of the Year (2017)

• Philadelphia Historic Martial Arts Society Hall of Honors – Inducted (2018)

• Who’s Who in the Martial Arts – Honoree (2018)

He is also actively involved in promoting unity and excellence within the martial arts community through leadership roles, including:

• Alliance – A Unity Within All Martial Arts – New Jersey State Director

• Universal Song Do Kwon Alliance – Member

• Global Korean Martial Arts Federation – Member

• New Jersey State Tournament Director – Since 2016

• International Council of Grandmasters – Inducted in 2018

A Living Legacy

Master Mertz’s story has been featured in Tae Kwon Do Times and Life Skills for Kids: A Book of Inspirational Stories from the Martial Arts. His journey is a testament to perseverance and the transformative power of martial arts, inspiring students of all ages to believe in themselves and pursue excellence.

With decades of experience and a deep commitment to both tradition and innovation, Master Mertz leads CHAMA with heart, skill, and an unwavering belief that anyone can achieve greatness through martial arts.

Pil Sung.

Master Instructor Ryan DuBosar

Ryan DuBosar began his martial arts career in 2013, advancing to black belt in 2016 and achieving the rank of master instructor in 2024 under the guidance of Master Joseph E. Martz. He emphasizes confidence-building in his students, recognizing the broader opportunities that a traditional martial arts program offers in creating a complete person, one with their mind, body, and spirit in balance. 

"May you be proud of the work you do, the person you are, and the difference you make."

Harrison Ellis-Williams
Instructor | 1st Dan Black Belt
Disciplines: Taekwondo & Muay Thai
Experience: 7 Years Martial Arts | 2 Years Teaching

Harrison Ellis-Williams began his martial arts journey at the age of five, training alongside his sister, aunt, and two cousins—an experience sparked by their shared love for the 3 Ninjas movie series. Although their mother originally hoped they would pursue Kung Fu, they found their path in Taekwondo, which became a family tradition.

Today, Harrison holds a 1st Dan Black Belt and actively practices both Taekwondo and Muay Thai. As an instructor with two years of teaching experience, his passion for martial arts extends beyond the physical—it’s a personal sanctuary. “As soon as I walk into class, everything else fades away. Training lets me focus completely on something I love, and every class is a chance to grow.”

When it comes to teaching, Harrison finds joy in watching his students evolve. “There’s nothing more rewarding than seeing someone push through their lowest moments and achieve something they didn’t think was possible. Watching that transformation is what keeps me teaching.”

Harrison comes from a proud martial arts lineage—there are five black belts in his family, including his sister, aunt, and two cousins. They all tested and earned their ranks together, graduating in the same class under Master Mertz. He is also the younger brother of Master Tashea.