Tang joined the Royal Hong Kong Police in 1976 as a Probationary Inspector. Prior to his promotion to a Superintendent in 1986, he served in divisions such as the
Police Tactical Unit and the
Special Duties Unit. Tang was promoted in 1992 to Senior Superintendent and posted as District Commander
Airport, Chief Superintendent Special Duty for the 1997
Handover of Sovereignty Ceremonies, District Commander of
Mongkok District, as well as Deputy Regional Commander of
Hong Kong Island Region. Between 1991 and 1993, Tang was seconded to the
London Metropolitan Police under the Superintendent Exchange Scheme and performed the role of a Divisional Superintendent. Tang then became Assistant Commissioner of Police (ACP) in 1999, Senior Assistant Commissioner of Police in March 2002, Deputy Commissioner of Police in December 2003, and as Deputy Commissioner of Police (Operations) took over responsibility for all aspects of the operational policing of the Force. On 16 January 2007, he succeeded
Lee Ming-Kwai as the
Commissioner of Police. ==Studies==