David Yao, the founder of www.LegooMandarin.com and Educational Video Courses Online (www.Edeo.biz), born in china, resides in Kuala Lumpur, Malaysia, holding Master degree from University Malaya, has 26 years’ experience in mandarin teaching for foreigners and creating a SYSTEM (more than 200 mandarin courses ) designed for foreigners to study Chinese as secondary language. He practices Tai Chi for almost 30 years and establishes Tai Chi Fitness Organization (http://taichifitness.org/) to modernize and promote Tai Chi for fitness and health.