民政事務總署
Tong studied at Diocesan Boys' School for secondary education, and graduated from Chinese University of Hong Kong. He joined the Government of Hong Kong in November 1972 and served as an officer in the Executive Department and Trade and Industry Department. In April 1992, he joined the political branch of the government. In April 2005, he received a promotion into a senior position in Home Affairs Department and was reassigned in many executive position within the government departments. In January 1999, he served as Undersecretary for Security in Security Bureau of Hong Kong. In September 2003, Tong was appointed as Commissioner of Customs and Excise for the Customs and Excise Department of Hong Kong. On 1 July 2007, he was appointed as Commissioner, Independent Commission Against Corruption (ICAC).