Dan Inosanto was a close friend of Bruce Lee, and one of a small group of martial artists more or less hand-picked by Bruce to help develop and carry on the Jun Fan Gung Fu/Jeet Kun Do system. He has been practically living and breathing martial arts longer than 99% of Sherdoggers have been living, and has absorbed and assimilated more styles than most folks have ever heard of. Insosanto is easily one of the most respected and authoritative martial artists walking the face of the Earth; I'm inclined to think that the fact that the man is still going strong with an active training and teaching schedule at age 70 wipes away any doubts as to his passion or dedication to MA.