Although my expertise is in Ying jow pai eagle claw, Nine birds Wudan Shaolin, and Southern White Crane/Long Fist/Yang tai chi (teachers Leung Shum/Ricky Anderson/Jeff Bolt from Dr. Yang Jwing Ming), I have known Dr. John Cheng since 1981 when we helped open Sifu Fogg's school in Marshall Tx. Besides a great mantis master (study his saber and spear technique, some of the best in the world plus he looks like a mantis doingh his stuff....and his legs are huge from his dedicated mantis footwork!). He is also an orthopaedic surgeon from Texas Tech with undergrad at Baylor here in Texas. Sifu Fogg is a great teacher and good person. Two of my three teachrs know him very well and after 31 years of training myself, I can honestly say John is one of the best people in the art! By the way, Jeff Hughes is also very good although I have found it interesting that he now trains in Ying Jow with our cousins the Lau family in California. But that is another story. Jeff is a very good martial artist and John is his senior under Raymond here in Texas. Hope this clarifies what Mantis Master has said. Other than my "bird" styles, I love Mantis footwork and enjoy the fact that mantis, eagle claw, and white crane are, in my opinion, the best chin na Northern styles.