SHIHAN-DAI Jacob Greasley
Sensei Jacob has been practising martial arts for more than 25 years. He trained extensively in Japan for several years under jujutsu and swordsmanship grandmaster Kunio Morimoto. He has also taught and performed demonstrations in Japan, the UK and the Caribbean. Sensei Jacob also holds a 4th Degree Black Belt and Kyoshi teaching license in Japanese Shito Ryu Karate-Do under Japanese karate master Sei Iwasa Shihan. He turned to martial arts training as a teenager and after several years of military service he founded Jikan Dojo in East London where he teaches Japanese martial arts to children and adults.

Though and engineer by profession, with a masters degree in electrical engineering he is also an experienced security officer and bouncer. 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 and practice Japanese martial arts. 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.



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 training in karate coaching and has the suitable background checks and qualifications.

He is also a practitioner of koryu iaijutsu and kenjutsu, old Japanese sword arts taught at Jikan Dojo.

STUDY GROUP LEADER - Jujutsu & Goshin Jutsu


SEMPAI Alistair Briggs

Sempai Al has been been a dedicated and passionate student of Jikan Dojo since he first started. He is appointed as a Study Group Leader for Shibukawa Ichi Ryu Jujutsu & Jikan Dojo Goshin Jutsu in the absence of the Chief Instructor. He is also a practitioner of koryu iaijutsu and kenjutsu, old Japanese sword arts taught at Jikan Dojo.