Based in Philadelphia, the Middle States Association is the worldwide leader in accreditation and school improvement. For over 135 years, MSA has been helping school leaders establish and reach their goals, develop strategic plans, promote staff development and advance student achievement. With more than 2,800 accredited schools and school systems in 44 states and over 110 countries, MSA is proud of its continuing legacy and its ongoing innovations to meet the challenges of improving education in the 21st century.