This study examines the effects of three group leadership styles on the personal and interpersonal functioning of 67 counselor trainees who participated in a required group experience in conjunction with a group experience course. Theparticipants were randomly assigned to one of three group conditions: (1) structured T-group, (2) rotating leadership, and (3) Rogerian. Each of the nine groups met approximately 20 hours over the course of the semester. Each subject completed the following instruments: Edward's Personal Preference Schedule, Money Problem Checklist, Rotter Incomplete Sentence Blank, and Reaction to Group Situation Test. Results from the pretest, posttest, and 6- to 8-weekfollow-up suggest that differences among the groups could in part be attributed to group leadership styles. The theoretical and practical implications of these results are discussed.