SiFu David Tsan aka 'Dawud' has been training Wing Chun under the tutelage of SiFu Garry McKenzie since 2010. In 2013, Sifu Garry granted him the permission to teach and Dawud opened his first school in Peckham. Since then, he has become heavily involved in teaching Wing Chun and is currently managing schools, clubs, and private sessions all around London. Dawud currently operates in the borough of Southwark, Lambeth, Chelsea, Camden, Redbridge, and Hackney.

In 2015, Sifu McKenzie promoted Dawud to 'Dai SiHing' (Senior Kung fu brother) at the children's classes in Hackney HQ. Dawud has taken part in various seminars and demonstrations associated with TWCS, including UK Wing Chun gathering, Wan Kam Leung London Seminar, Festival Asia and TWCS 25th Anniversary.

In November 2015, Dawud was fortunate enough to be part of the group visit to Hong Kong and Foshan China. He visited various Wing Chun Schools across the country and took part in demonstrations and seminars with TWCS. He had the privilege to meet SiGung Ip Ching and other Wing Chun SiFus such as Chau Lin Fat, Kong Chi Keung, Buick Yip, Hawkins Cheung, Sam Lau, John Wong and many others.

Dawud is also a Business Studies Teacher and holds a Qualified Teacher Status (QTS). In addition, he is a Level 2 qualified Fitness Instructor, is licensed with the Amateur Martial Arts Association (AMA), registered with the Ving Tsun Athletic Association (VTAA), CRB certified and is First Aid trained.