Chun started his career with the Institute Technology MARA (ITM) in 1985 as a part-time lecturer. In 1986 he joined Malaysia Airlines and in the 20 years with the national carrier, had been assigned to marketing, sales, business development and at Golden Holidays. He was also briefly seconded, as part of a selected team, to Trifiniti Networks to develop an online ticketing portal for Malaysia Airlines. His last position in Malaysia Airlines was as Area Manager Sri Lanka & Maldives, having had previous tours of duty to Thailand, Philippines and Hong Kong aside from other domestic stations in Malaysia such as Langkawi, Melaka, Ipoh and Terengganu. In 2007, Chun joined RBC Ministries Asia-Pacific in project management and was with UCSI Blue Ocean Strategy Regional Centre from 2008 - 2010 as Manager International Marketing & Operations.

Chun holds a Masters degree (M.A.Hons ) in Political Science from the University of Canterbury, New Zealand.