J C Sum (born Sum Jan-chung; 5 December 1976) is a Singaporean hybrid marketer, author, content creator, former illusionist and illusion designer. During his time as a professional illusionist, Sum was nicknamed "The Thinking Man's Magician", Sum was one of the most highly regarded illusionists and illusion designers from Asia. AsiaOne named him as "one of the most celebrated illusionists in Asia" and MagicSeen called him "The Ace in Asia". The Straits Times stated that he is "Singapore's most famous magician" and The Business Times of Singapore, credited him for bringing "magic to the mainstream market in Asia".