Wong Shun Leung..
Took Yip Man's wing chun teachings and applied them in many many streetfights (beimo fights), cut out a fair amount of the crap and taught what really worked, and he was a great teacher and had a sound fight philosophy..
Bruce Lee was special, but he would never have been anything without Wong's instruction. And the only reason he went to Wong was due to the man's monumental reputation. (unbeaten)
If anyone has seen the "Ip Man" film released in 2009, the second will be out this year, and i believe it will be featuring Wong (not the real man obviously, he died tragically 13 years ago) as Yip man's principle instructor. I'm looking forward to seeing if it does him justice. (I'm possibly biased, been training hard in WSL Wing Chun since I was a teen)