SHIHAN-DAI Jacob Greasley
Sensei Jacob has been practising martial arts for more than 25 years. He trained extensively in Japan for several years in jujutsu and swordsmanship and was awarded the rank of 5th Dan, Shihan-dai in jujutsu in Japan. Sensei Jacob also holds a 4th Degree Black Belt in Shito Ryu karate and was issued the 'Kyoshi' teaching license by Seiken Shudo Kai under Japanese master Sei Iwasa Shihan. He turned to martial arts training as a teenager and after several years of service in the British military he founded Jikan Dojo in East London where he teaches many children and adults today.

Though an engineer by profession, with a masters degree in electrical engineering he is also an experienced SIA security officer. He holds a DBS (formerly CRB) background check, along with qualifications in karate & sports coaching, Safeguarding & Protecting Children and First Aid.


Sensei Jacob regularly travels to Europe, the Caribbean, Japan & Okinawa to teach, demonstrate and practice Japanese martial arts. With guidance from his own teachers and mentors he works to promote traditional martial arts not only as a means of self-defence but also for personal growth and moral development. Read his article Karate Beyond Technique.



SENSEI David Christenson

Sensei David holds a 2nd Degree Black Belt in Shito Ryu karate and has been training for over 20 yrs. He is originally from Fresno, California USA and settled in the UK a couple years ago. He has an enhanced DBS and training in karate coaching. He is also a practitioner of kobudo (weaponry) taught at Jikan Dojo.