Tsui Yuen (徐緣), whose original name is Tsui Chun-man, is a professional in marketing brand management, as well as a famous author and business speaker. He was a part-time lecturer in the Chinese University of Hong Kong, The Hong Kong Polytechnic University and HKU School of Professional and Continuing Education. After graduating from the Faculty of Business Administration of The Chinese University of Hong Kong in 1999, he joined British American Tobacco plc. as a management trainee, and left as a brand manager. In 2004, he joined Unilever plc., being in charge of the promotion of food business. He was then employed by Mentholatum as the Director of Sales and Marketing, engaging in brand management of skincare products and medicine.

Since 2009 he has used Tsui Yuen as his pen name and started writing about Marketing & Advertising. In 2012, Tsui Yuen was invited to write a column for “Sky Post” and "House News". His passages then extended to other media platforms, such as "Apple Daily", "100 Most” and “Pentoy”. Tsui released several personal publications, in which “Cool Marketing” (《型銷》) became the top of the whole year in 2014 Eslite Annual Bestsellers of the Finance and Business group. It was also selected in the PageOne Bestsellers, and won the first Golden Book Award (Non-Literature—Life and Health). At the end of 2014, Tsui joined Next Mobile, the subsidiary of Next Digital Limited, as a Chief Marketing Officer. In early 2017, he started his own marketing consultancy firm, Toast Communications, which specializes in content marketing.