I would like to poke my nose in here, and so you know I have a rather large nose.
First I would like to state I am not a TSD stylist. as a child I studied with my father who trained with Lynn jackson in Tang Soo Do, in Lorain, then Elyria Ohio, he began with mr jackson around 72, i still remember helping dye his belt after his promotion., and then watching him sew material onto his belt for the next rank.
I have read a decent amount and heard a decent amount of things about the founder and style most commonly called today, Tang Soo Do.
I certainly feel at some point there was a need or reason for the use of Tang, which referrs to the Tang Dynasty of china roughly beggining in 600 ad and ending in 900 ad, many great warriors and arts came from this time in china's history.
I do have a biased opinion of the founder studying Yang tai Chi to any decent level. As a CMA's I have seen the ways these arts are taught and the unfortunate pregudice of the Chinese teachers. The arts are taught three ways and only the first is known by the vast magority, this is what is reffered to as the public arts, and this is what just about everyone does or knows, only a select few ever make it to the Closed Door teachings, this is reserved for the top students who have dedicated themselves to their teacher and the art, the third way is the family style, don't confuse this with the term "gar" or the use of it today. this way is reserved only for family members and top disciples, and there are only a very, very small amount of people who learn this method.
for me to be told a foriegner trained for a small amount of time in tai chi and was good enough to teach it is very hard for me to beleive, even if he studied for 2 years (which I here more often it being 6 months) and 8 hours a day, he still would have only been learning the basics and intermediate aspects of the public form, we are not talking hun gar, wing chun or the like, which you could get sufficient at with that amount of time, but tai chi, i just find it real hard to beleive.
agian just my opinion.