This study focuses on the Duality Role of CEO and Chairman in Corporate Governance and Firm Performance of Public Listed Companies in Malaysia. For this study, there are three objectives, which are to measure the level of firm performance of Public Listed Companies after the introduction of Malaysia Code Governance (MCCG) 2012 and also to examine the relationship between the Duality Role of CEO and Chairman in Corporate Governance (board monitoring role, quality decision making and improved investor confidence) and firm performance of public listed companies in Malaysia. The study also aims to determine the major contribution of Duality Role of CEO and Chairman (board monitoring role, quality decision making and improved investor confidence) in improving the firm performance of Public Listed Companies in Malaysia. In order to collect the data of the respondents, systematic technique was used in distributing the questionnaire and 166 respondents as the sample size for this study. Based on the descriptive analysis emphasized on mean and standard deviation, it exhibited that the level of the firm performance of Public Listed Company in Malaysia after MCCG 2012 is at a high level. The other findings of this study shows that all the three independent variables namely, board monitoring role, quality decision making and improving investor confidence, shows statistically significant and marked degree of correlation with the firm performance of Public Listed Companies in Malaysia where (p<0.01). Board monitoring role was the major contribution of separate role of CEO and Chairman in improving the firm performance (B =0.387, t=5.153, p<0.01). Finally, it is recommended for the government to revise at the regulation regarding the separation position for CEO and Chairman. Regarding this regulation, the governemnet should make it as compulsory for Malaysia Public Listed Companies to comply with MCCG 2012. The government also may establish a focused framework for monitoring the performance of Malaysia Public Listed Companies in order to improve their performance. Another recommendation is that, the government may provide the continuous training and series of discussion that need to be attended by both, the chairman and CEO in order to increase the effectiveness in the management of the company.