John Markley, MBA

John Markley serves as Chief Executive Officer of Centerstone Illinois, the state’s largest behavioral healthcare provider serving residents in eastern and southern Illinois through more than 30 locations, providing treatment, support and educational programs and services to individuals who have mental health and addiction disorders and specialized services for adults with intellectual and developmental disabilities. Centerstone employs over 525 staff in Illinois and serves more than 17,000 individuals annually. Under Markley’s leadership, Illinois’ operations have expanded from serving residents in southern Illinois to include eastern Illinois following a 2015 merger with Wellspring Resources in Alton, Illinois (now Centerstone). Markley has served on several national and statewide boards and is currently a member of several state and national associations. He began his behavioral health career in 1985 as a staff accountant, was promoted to Director of Financial Services, and became CEO in 2005. He received his BS in Criminal Justice and in Accounting from Murray State University in Kentucky and MBA from Century University in New Mexico. As CEO, Markley is responsible for the leadership and operational oversight of Centerstone’s Illinois clinical divisions, specialized services, as well as strategic business development and fiscal accountability.