Tim Cartmell learned Sun taiji from Sun Lu Tang's daughter and grandson. He has created the definitive DVD set and book on the style. If you're in Southern California and are interested in learning Sun style taijiquan from Tim, he has a regular weekly class every Monday, from noon to 1:00 p.m. The class takes place at Ace Jiu-jitsu at 18225 Brookhurst Street in Fountain Valley. It's located just a few blocks west of the Brookhurst off-ramp from the 405 freeway. First-timers and beginners are welcome.
Btw, if you want to make more of a day of it, Tim also teaches an on-going class in Sun Baguazhang immediately prior to the taiji class. 11:00 a.m. to noon.