Wan Kam Leung Practical Wing Chun NYC, New York - William Kwok HQ, Practical Wing Chun Kung Fu is a self defense program offered by Gotham Martial Arts located in the Upper East Side of Manhattan, New York City. This Wing Chun system was modified and developed by Grandmaster WAN Kam Leung, a senior disciple of late Wing Chun (Ving Tsun) legend WONG Shun Leung.