Tuan Ng Keok Chai started his career as a Police Inspector with the Royal Malaysia Police in 1982. He was then posted to serve in Sarawak and he served there until the rank of Assistant Superintendent of Police for 20 years. During his tenure in Sarawak, his exposure included the Criminal Investigation Department (CID), General Duty and Police Field Force.

In 2003, Tuan Ng was transferred to Selangor Police Contingent Headquarters to serve in Traffic Branch. In 2005, he was promoted to Deputy Superintendent of Police and served in Commercial Crimes Investigation Department, Selangor Police Contingent Headquarters. He was promoted to Superintendent in 2008 and posted as Deputy Head of Commercial Crime Investigation Department, Selangor Polis Contingent Headquarters.

After that, Tuan Ng was posted to Johor Police Contingent Headquarters as Deputy Head of Commercial Crimes Investigation Department in 2014. Then in the same year, he was posted to Commercial Crimes Investigation Department, Royal Malaysia Police, Bukit Aman as Assistant Director in Forensic Accounting Investigation Division.

He was promoted to Assistant Commissioner of Police in 2016 and his last held position was that of Principal Assistant Director in Forensic Accounting Investigation Division, Commercial Crimes Investigation Department, Royal Malaysia Police, Bukit Aman.

Throughout his 36 years service in Royal Malaysia Police, he was very much involved in police investigations due to his legal background. He specializes in criminal investigation across various fields which include commercial crime, general crime and forensic accounting with ample management and special operations experience.

1. Dynaciate Group Berhad; 
2. Hong Seng Consolidated Berhad; and
3. CSH Alliance Berhad (formerly known as KTG Berhad).

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