Professor Rick Clark is a specialist in applying pressure points using techniques from the katas/patterns. He has a very good understanding of both Japanese/Okinawan katas as well as Korean. When you see his qualifications, you’ll understand why:
8th Dan Ryukyu Kempo
7th Dan Tae Kwon Do Chung Do Kwan
7th Dan Ju-jitsu
5th Dan Judo
3rd Dan Modern Arnis
1st [...]