The purpose of this study is to examine the association between Chief Executive Officer (CEO) characteristics on firm performance. Tobin's Q measures firm performance; while CEO's characteristics are measured by tenure, age, professional certification in finance or accounting, advanced education in finance or accounting, status (insiders or outsiders) and gender. The hypotheses are tested using regression analysis using 235 firm-year observation from six ASEAN countries (Singapore, Malaysia, Indonesia, Thailand, Philippines, and Vietnam) in the year 2015. The results show that CEO age and tenure have a positive association with firm performance. This study is critical because it delivers evidence on the link between the characteristics of the CEO and firm performance. CEO characteristic will give a positive impact on companies' firm performance. Overall, investors need to pay attention to the essence of a CEO that is proved can affect better firm performance when making an investment decision.