Not too sure what you mean by groups but there is the group I am a part of that is headed by Paul Vunak- Progressive Fighting Systems
www.fighting.net 949-248-8999
Outside of this group it helps to identify if you are looking for, and I hate to say it, but Original JKD or JKD Concepts. JKDC is for the most part from Dan Inosanto's camp and he has many Instructors some of them are
Paul Vunak & Progressive Fighting Systems:
Burton Richardson & Jeet Kune Do Unlimited,
Ron Balicki,
Rick Fay & Minnesota Kali Group,
Rick Tucci & Princton Academy of Martial Arts,
Mark Stewart and Boxer Rebellion International,
Chris Kent, Bosie Idaho
These are some of Dan's main Instructors. Of them they each have their own group of Instructors. I know the PFS website has an Instructor tree and map for PFS Instructors
Hope this helps some.
Of the OJKD Instructors. I have to say that many are being certified by a person who had "potentially" 4 to 5 meetings with Bruce Lee and not all of them were training times. This person has since been certifying others in JKD when he has had very little experience with it. In addition many of these people are very well published and popular and seem to get much press. The down side is they influence those people who read the articles. Right or wrong it gives a tainted picture of what the history is as well as who is who for real. I all comes back to Dan Inosanto or Taky Kimura as the two only living certified people by Bruce. Of anyone ever certified, Only Dan was certified in all of the Three arts Bruce offered Certification, Jun Fan Gung Fu, Tao of Chinese Gung Fu and Jeet Kune Do.
I am sorry but I have run away with this. Ramble, ramble. I will work at staying the course
