Using quantitative and qualitative analysis, the perceived impact of post-master's experience (PME) during counselor education and supervision (CES) doctoral study was examined across five core areas of professional identity development: counseling, supervision, teaching, research and scholarship, and leadership and advocacy. The results showed positive perceptions of the impact of PME in four of the five core areas, with significant relationships between the amount of PME and perceived impact on supervision and leadership and advocacy. Implications inform CES doctoral admissions committees as well as faculty who advise master's students interested in pursuing a doctoral degree in CES.