John Markley serves as Regional CEO in Illinois, serving residents in eastern and southern Illinois through more than 30 locations that provide 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 western Illinois following a 2015 merger with Wellspring Resources (now Centerstone) in Alton.
He has served on several national and statewide boards and is currently a member of several state and national associations.
Markley 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 bachelor’s degrees in criminal justice and accounting from Murray State University in Kentucky, and his MBA from Century University in New Mexico.
As CEO, Markley is responsible for the leadership and operational oversight of Centerstone’s clinical divisions, specialized services and strategic business development and fiscal accountability in Illinois.