The objectives of this research were to understand the role and focus in counseling supervision by applying Rational Emotional Behavioral Therapy (REBT) to view the supervision process and to supervise the counselor subject in an eclectic approach. This was a qualitative research study using unique-case sampling. The subject has been a male who is a counselor, teacher, and researcher of REBT for many years, supervising postgraduate students who counsel clients at the mental health center. The research data were recorded opinions about the supervision in 96 case records. The researcher transformed the handwritten manuscripts into electronic computer file format, then coded the data (for process coding and induction analysis), and finally used Bernard’s discrimination model for the analysis. The results were presented as follows: The counseling supervision of REBT was more about the teacher role, consultants, but less about the counselor role. The supervision focused on the process skills (or intervention skills), (including basic-communication skills, developing skills and strategies, changing skills, initial and ending skills), conceptualization skills (including forming the concepts to the clients, specific problem, and strategies), and personalization skills (including self-awareness of emotional characters that would influence the effectiveness of counseling, and the identification of professional ethics). Suggestions for future research and practices in relation to these results are offered.