MAC is one of the nation's largest regional professional associations for archivists. Founded in 1972, MAC now has more than 800 individual members. MAC's institutional members include a variety of corporate, government, religious, and university archives, as well as historical societies and other manuscripts repositories and special collections. The MAC region is the 13 heartland states: Illinois, Indiana, Iowa, Kansas, Kentucky, Michigan, Minnesota, Missouri, Nebraska, North Dakota, South Dakota, Ohio, and Wisconsin. However, MAC has individual and institutional members from many other states--and even other nations--and more are always welcome. As an organization, MAC is committed to advancing the archival profession and community. Further, MAC's organizational commitment to social responsibility reflects the accountability, stewardship, transparency, fairness, professionalism, and balance that make up an individual archivist's core values. MAC’s values are clearly manifested in its meeting planning, programming, and publishing processes.