Upon his graduation, he joined Malaysian Agricultural Research & Development Institute (MARDI) (Crop Protection Division), as a research assistant and later promoted to the research officer. In 1979, he obtained a PhD in Mycology and Plant Pathology from Queens University, Belfast, Northern Ireland. 

In 1980, he held the position of research officer of MARDI (Cocoa and Coconut Research Division) and promoted to the position of Deputy Director in 1984. Later in 1985, he became the Director of the Cocoa and Coconut Research Division. As a Director, he was responsible for planning, managing and overseeing all research programmes under this division. In addition, he was also involved in the implementation and development programmes for cocoa smallholders. In 1990, he joined MCB as the Deputy Director General (Market Development and Regulatory). He was in charge of marketing, promoting, licensing and grading of cocoa beans and cocoa products. He also represented Malaysia in various meetings and trade negotiations held by International Cocoa Organisation (ICCO). In 1996, he was promoted to the post of Director General of MCB. As the Director General, he was responsible for planning, developing and managing all research programmes which involved improvement of cocoa yield and quality as well as development of cocoa products and related downstream activities. In addition, he oversaw the implementation and enforcement of regulations on quality of cocoa beans and cocoa products. He held this position until he retired in 2001. Through the years, he has published more than 30 papers, mostly on cocoa. Currently, he is a member of Malaysian Plant Protection Society and Incorporated Society of Planters (ISP).

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Direct - 211,998 ordinary shares and 35,333 warrants in Guan Chong Berhad
Indirect - 58,159,998 ordinary shares and 9,693,333 warrants in Guan Chong Berhad