Nic Gregoriades

Nic Gregoriades


Nicolas Gregoriades is the Head Instructor of the Jiu Jitsu Brotherhood. He is the first person to be awarded the black belt by the legendary Roger Gracie. He is widely regarded as one of the outstanding jiu-jitsu instructors contributing to the art today. By combining deep conceptual and technical knowledge with a methodical, patient teaching style, Nic ensures all his students learn quickly and enjoyably.

Nic regularly teaches classes at JJB London when he is not travelling and teaching seminars across the globe.


 Marc Barton


Marc is a lifelong martial artist, starting at a young age with ninjutsu, and then Shotokan karate in his late teens. He trained in this for many years, achieving a 2nd Dan black belt. Karate also inspired travel to Japan where he trained at the Shotokan Headquarters in Tokyo for three months in 1999.

Brazilian jiu-jitsu became a new focus in 2007 when he discovered the Roger Gracie Academy in London. Marc trained here regularly for several years and this is where he first met Nic Gregoriades and has continued to train with him ever since. Marc was awarded his black belt by Nic in December 2016.

Marc is also one of a small number of black belts personally mentored by the legendary Mauricio Gomes, who introduced BJJ to the U.K. in the early 2000s, and is the father of the legendary Roger Gracie.

Marc now runs Jiu Jitsu Brotherhood London and teaches many of the classes when Nic is away. He has also introduced a highly successful kids programme in Kingston, and has loved the chance of introducing jiu jitsu to his children. Jiu Jitsu Brotherhood and its ethos are now an integral part of Marc’s life.


Oliver Geddes

Oliver Geddes


Oliver Geddes is a Brazilian Jiujitsu black belt under 10-time World Champion Roger Gracie. He began training at a local school in 2005, but quickly moved into London to train at the famous Roger Gracie Academy. From this base he settled into training full-time, eventually receiving his black belt in December 2011 after a little over 6 years of hard study.

Since then, he has spent time travelling, training and competing all over the world, always looking to further his knowledge with new partners in new locations.

Oli now teaches regularly at JJB London when not travelling the world to teach and compete.


Alan Kentish



Alan is one of our most experienced grapplers and instructors, holding a black belt in Judo for over 20 years in addition to a brown belt in Brazilian Jiu-Jitsu. Alan is currently a 2nd Dan black belt in Judo under the British Judo Association (BJA).

His unique perspective of both arts has enabled him to isolate the takedowns and stand up work that he feels is most relevant to BJJ practitioners. Alan regularly teaches our ‘Judo for BJJ’ sessions on Wednesday evenings. Alan is also available for one-to-one private lessons – contact us if you would like book one.


Andreas Wichmann



Andreas came to Jiu Jitsu via training in Muay Thai and grappling in his early thirties. Due to work commitments, he took a break for a few years but returned to Jiu-Jitsu in 2015 in order to get in shape for his wedding. He hasn’t left us since, and apparently, you can teach an old dog new tricks as he won a Gold medal in the NAGA No-Gi competition, as well as Silver and Bronze medals in IBJFF, NAGA and the Surrey Open Gi. Andreas is our competition team captain and organises our extra pre-competition preparation classes.

Andreas’ attention to detail style of teaching helps our beginners get up to speed quickly and understand the basic concepts of BJJ. He also very much enjoys stretching and yoga and emphasises it in his warm-ups, having learned the hard way how important flexibility is.


Clare Barton


Clare has been practising martial arts for over 20 years, starting with Shotokan karate whilst at University in 1997 and gaining her 1st Dan black belt in 2001. She also travelled to Japan with Marc to train at the Shotokan Headquarters in Tokyo for 3 months in 1999.

Clare started her jiu-jitsu journey in 2014 after constant nagging by her kids, taking part in the first Jiu Jitsu Brotherhood London beginners course. She fell in love with the art and has continued training ever since. Clare was awarded her blue belt in 2016. She loves teaching children and is now a vital part of the kids coaching team. Clare also organises and helps to teach our ladies only classes.

Clare is also the author of the popular healthy living blog In the Zen Garden