The 2500+ members of MPA make it one of the largest regional psychological associations in the country. Members hold positions in universities, colleges, hospitals, clinics, school systems, business and industry, government and private practice. They teach, conduct research in laboratory, field, and industrial settings, do diagnosis, therapy, and counseling, and serve as administrators and consultants. Their interests are among the most diverse in any professional association: from the physiology of vision to social stereotyping, from political psychology to medical psychology, from organizational behavior to children's language development, from memory to depression, from sex roles to drug addiction. They make professional use of textbooks, films, computers, tests, research apparatus, biofeedback equipment, and other materials relevant to clinical and business practice.