Career
He was the president of Hong Kong Institute of Certified Public Accountants. Sun began his career at Ernst & Young in 1977 after receiving his Master of Accountancy degree. He was the partner in charge of the Akai Holdings account from 1991 to 1999.
When Akai went bust in 2000, the liquidators accused East&Y of falsifying documents and tampering with audit documents between 1994 and 1998 to cover up the theft of over United States$800m by Akai"s chairman, James Ting.
Ting was imprisoned for false accounting in 2005, and East&Y paid $200m to settle the negligence case out of court in September 2009. In a separate lawsuit a former EY partner, Cristopher Ho, made a "substantial payment" to Akai creditors in his role as chairman of the company that had bought Akai just before it went bust in 2000.
In 2003, he became the president of Hong Kong Institute of Certified Public Accountants until 2007. Sun was later appointed as Director of Audit of Hong Kong in July 2012.