This study investigated the hypothesis that A therapists are more persuasive than B therapists. Fifteen male and six female therapists each tape recorded three therapy sessions with one of their neurotic outpatients, and three sessions with one of their schizoid or schizophrenic outpatients. Therapists, patients, and an independent rater rated: a) patients' acceptance of therapists' “messages” to them; b) therapists' embodiment of four correlates of persuasiveness; and c) therapists' general persuasiveness. Analyses of variance showed significant A > B differences on two measurements: message acceptance rated by rater, and total-of-four correlates rated by therapist; the seven other analyses showed non significant A > B differences. Results were interpreted as essentially null or at best mildly supportive of the hypothesis.