He's an experienced security officer and bouncer and travels to Europe, the Caribbean, Japan & Okinawa to teach and practice Japanese martial arts. Sensei Jacob holds a DBS (formerly CRB) background check along with qualifications in karate & sports coaching, Safeguarding & Protecting Children and First Aid.


With guidance from his own teachers and mentors he works to promote martial arts not only as a means of self-defence but also for personal growth and moral development. Read his article Karate Beyond Technique.


KYOSHI Jacob Greasley
Sensei Jacob is a 4th Degree Black Belt in Japanese Shito Ryu Karate-Do and a student of Japanese karate master Sei Iwasa Shihan. He is also the London branch manager for the Japanese koryu budo organisation Kanoukan and a personal student of its founder Kunio Morimoto Shihan. Sensei Jacob who has been practicing martial arts for more than 20 years is a former aircraft engineer, and turned to martial arts training as a teenager. After several years of military service he founded Jikan Dojo in East London from which he teaches Japanese martial arts to children and adults.

 Jikan Dojo  Technical  Directors 

 Mentors & 

 Guest  Instructors 

Sensei Anthony Holt

5th Dan Kobayashi Shorin Ryu


Sensei Holt is one of the senior instructors of Kazokukai International and a senior student of sensei Ridgeway. He has been practising karate for over 20 years and has been to Okinawa on several occasions training with some of the greatest karate masters alive. He currently instructs the Bishops Wood Karate Club in Staffordshire and is a guest instructor at Jikan Dojo.