1978-1989 Chemist in the following Sections of the Forensic Science Division of Government Laboratory Hong Kong: Narcotics, Toxicology, Physical Sciences, Chemical Sciences, Instrumentation & Quality Assurance 1990-1996 Chemist in the Questioned Documents Section [QDS] 1996-2004 Senior Chemist in, and the Section Head of, the QDS 2004-to date Forensic Handwriting & Document Examiner Former Section Head, Senior Chemist, Questioned Documents Section, Forensic Science Division, Government Laboratory, HKSAR Member of the Royal Society of Chemistry, UK [MRSC] Chartered Chemist Corresponding Member of the American Society of Questioned Document Examiner [ASQDE] Member of the Forensic Medicine Association of China