David Yao is an EdTech innovator, educational content creator, and publisher specializing in multilingual literacy systems and universal language learning frameworks. He is the practitioner and creator of the EDEO Thematic Universal Language Learning Framework and the Micro‑Step Reading & Listening System, both actively developed and self‑tested across 10+ languages and growing.

David is the founder of Legoo Mandarin and Edeo (Educational Video Courses Online), platforms that collectively host his extensive library of educational products. Born in China and now based in Kuala Lumpur, Malaysia, he holds a Master’s degree in IT from the University of Malaya and brings over 30 years of experience teaching Mandarin to international learners.

He has built a comprehensive Mandarin learning ecosystem featuring 200+ structured courses for non‑native speakers, including Micro‑Step textbooks designed for modern teaching environments. His curriculum covers major international examinations such as HSK, IGCSE, IB, AP, and SAT Chinese, and is now expanding to support other IGCSE, IB, AP, and SAT language subjects.

Beyond language education, David has practiced Tai Chi for nearly 30 years and founded the Tai Chi Fitness Organization to promote Tai Chi as a pathway to health, balance, and lifelong wellness.

All of David’s educational systems, courses, and publications are available through his integrated, all‑in‑one learning platform.