Our Instructors


Our Encinitas Karate instructors go through a very extensive selection process to insure we have only the best and most talented instructors in the world. Once selected, they are put through an intense and rigorous training period to guarantee the quality of instruction that our students will receive. Once a Encinitas Karate instructor is certified to teach our unique and effective system, they are then required to receive continuing martial arts and instructor education yearly. All our Certified Instructors are hold Black Belts, and most of them have been practicing Martial Arts since childhood.

This on-going training allows our instructors to stay up to date on the latest and most effective self- defense techniques, teaching methods, and exercise science. This re-certification process is our assurance that every Encinitas Karate student will continue to receive only the very best in martial arts training. Encinitas Karate instructors are professionals, we are experts in what we do. We expect our instructors to be the best, so you can expect the best from our instructors.

Each student is treated with respect, and is trained to the best of their own ability and potential. A student is never compared to anyone else. All of our instructors are highly motivated and care about ‘proper instruction’ of each and every student. All techniques are shown, broken down and taught in a slow, controlled and most importantly, supervised environment, until such a time as the instructors feel the student has mastered the technique.

At Encinitas Karate our instructors are there to guide, instruct, and motivate you to be the best that you can be.


Master Santhi Castle began her martial arts career in 1982 at the young age of 10 years old in Kajang, Malaysia. After 8 years of consistent training and dedication to traditional Shotokan karate, she earned her 1st Degree Black belt. She has spent more than 32 years training in Martial Arts.

Santhi relocated to the United States in 1993 where she continued her training in Shotokan Karate.

In mid 2000, Master Castle transitioned into the martial arts style of Tang Soo Do at Encinitas Karate in Encinitas, California. The school’s mission is to make students more successful in life by teaching a Karate based traditional martial arts system producing students who are positive, confident, respectful and who adhere to high personal standards of conduct.

In 2004, Master Castle was made partner in the business.

Master Castle & Encinitas Karate headed up their first major fundraising event to support the relief efforts in the aftermath of Hurricane Katrina in September of 2005. The event raised nearly $2000.

The next major fundraiser was held in 2007 in support of St. Jude’s Children Hospital bringing in almost $9000!

2014 was a pivotal year for Master Castle. First, she became the sole owner of Encinitas Karate. Next she tested and met the requirements to earn her 4th Degree Black Belt in Tang Soo Do. Finally, she successfully spearheaded a fundraiser in support of the firefighters who risked their lives putting out the San Diego County wildfires, raising just over $14,600! And in 2015, she was awarded Woman of the Year by the State Assembly! Quite the accomplishment!

Master Castle lives in Encinitas with her 21-year-old son, Skyler.


Mr. Castle has been teaching Tang Soo Do with us since 2014, and began his martial arts training at the age of four, under Master Castle. He also achieved his 1st, 2nd, and 3rd degree black belts under Master Castle here at Encinitas Karate.

Through over 15 years of training Mr. Castle has adopted his mother’s passion for martial arts and made it his own, now using what he has learned to teach our young students and guide them on the path to becoming successful martial artists. Considering that every student has different strengths and weaknesses, Mr. Castle believes in getting to know students individually in order to understand how best to teach and guide them on their journey.

Outside of the studio, Mr. Castle studies accounting and business at California State University San Marcos and enjoys video gaming, spending time with close friends and is a car enthusiast.