Client outcomes in psychology training clinics have been shown to be generally worse than other outpatient settings. Although this finding has been repeatedly demonstrated, no consensus of cause has emerged in the literature. One possible explanation of such findings may relate to psychotherapist effects, a historically neglected variable that has received increased attention in more recent literature. Among psychotherapist effects researched, competency has emerged as a compelling factor worthy of more research. Given that most growth in competence occurs during graduate training, investigating the relationship between competency and client outcome offers great potential benefit for informing optimal training, nature of client symptom improvement, and a more accurate depiction of differences in psychotherapist effects across training and non-training settings. The purpose of this study was to explore the trajectory of competence development during doctoral training in health services psychology and to investigate the association of trainee competency to the psychotherapy outcomes evidenced by their clients. Practicum evaluations of 36 trainees and outcome data (using the Outcome Questionnaire-45.2) from 244 adult clients were included in analyses. Results of the study suggest there is a positive relationship between cumulative semesters of training and competency scores (rs[118]= .34, p < .001). Notably, there was no significant difference in psychotherapy outcome between low and high trainee competence. The results of the current study, relevant literature and limitations are discussed. Suggestions for future research are proposed.