Supervises a professional staff by interviewing, hiring, assigning and reviewing work and evaluating the performance of incumbents. Selects, administers, scores, and interprets psychological tests in order to obtain information on client intelligence, achievements, interests, and personalities. Develops and implements individual treatment plans by specifying type, frequency, intensity, and duration of therapy. Evaluates the effectiveness of counseling or treatments and the accuracy and completeness of diagnoses, and modifies plans and diagnoses as necessary. Develops, directs, and participates in training programs for staff and students and evaluates activities engaged in patient assessment and treatment. Counsels individuals and groups regarding problems such as stress, substance abuse, and family situations, to modify behavior and/or improve personal, social, and vocational adjustment. Identifies psychological, emotional, or behavioral issues and diagnoses disorders using information obtained from interviews, tests, records, and reference materials. Obtains and studies medical, psychological, social, and family histories by interviewing individuals, couples, and/or families. Prepares and maintains written reports and required paperwork. Testifies in court as an expert witness to provide psychological insight and explain results of psychological examinations. Performs other duties as assigned.