Nashville — Centerstone, a not-for-profit health system specializing in mental health and substance use disorder treatments, has announced that John Markley, regional chief executive officer, will retire at the end of June 2022.

Markley has been a valuable member of Centerstone and its legacy organizations for nearly 38 years, having joined the organization in 1985 as staff accountant.  Since then, he has helped the non-profit grow from a relatively small organization serving just two counties into one of the largest community-based behavioral healthcare providers in the country.

“John has been a trusted leader and mentor to Centerstone for nearly four decades. He has served the patients, communities, and teams in Illinois with a grace and dedication that is an example for us all,” says David Guth, chief executive officer for Centerstone.

As regional CEO, Markley leads a business unit of more than 600 professionals and has helped shepherd the organization’s operations in Illinois from $16 million in revenues in 2012 to more than $44 million in revenues in 2021. Markley has also been instrumental in leading the organization through four mergers in Illinois, allowing for Centerstone’s services to now serve patients throughout the entirety of the Southern Illinois region.