I am John Guarnieri, owner and head instructor at 603 Karate in Northfield, NH. Martial Arts has been a passion of mine for many years, and now I have the pleasure of sharing that passion daily.

I have studied many martial arts over the years, but I fell in love with Uechi Ryu Karate due to its practical effectiveness while maintaining its traditional roots. Studying Uechi Ryu Karate helped me develop tremendous self-confidence in everything I do, including working patrol in the 9 years I served in NH Law Enforcement.

Although I am now a school owner, I am always a student first. I'm humbled to study Uechi Ryu under my instructors, Grandmaster George Mattson and Sensei Justin Testa.

If you would like to experience what consistent Karate training can do for you, it would be my pleasure to help you get started!

Standing on the shoulders of giants...

Standing proud with my Senseis!

Grandmaster George Mattson on the left.

Sensei Justin Testa on the right.

It is an amazing experience to learning from these gentlemen!

With Soke Sadanao Uechi, 4th generation head of the Uechi family.

It was an honor to meet and train with Soke Uechi. Uechi Ryu Karate is under strong leadership.