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Leadership

John Markley, MBA – Regional Chief Executive Officer John Markley, MBA – Regional Chief Executive Officer

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.


Mirza S. Baig, MD – Regional Chief Medical Officer Mirza S. Baig, MD – Regional Chief Medical Officer

Dr. Mirza Baig has served as Medical Director for Centerstone in Illinois and its legacy organizations for nearly 15 years. Previously, he managed the forensic unit of an Illinois state operated facility for 20 years.

Dr. Baig received his MD from Kakatiya Medical College in India and completed his psychiatric residency at the Missouri Institute of Psychiatry. He is board certified in addiction medicine, psychiatry, forensic psychiatry, geriatric and administrative psychiatry, and has over 35 years of experience in psychiatric medicine.


Anne Tyree, MPA, CFRE – Regional Chief Operating Officer Anne Tyree, MPA, CFRE – Regional Chief Operating Officer

Anne Tyree, MPA, CFRE, is Regional Chief Operating Officer in Illinois. In this role, she oversees all operations, administrative, and support systems for 600 employees serving more than 12,000 clients annually. Previously, Tyree served as Chief Administrative Officer and Chief Financial Officer.

She has over 20 years experience in strategic business planning, marketing, financial reporting and budgeting, business development, and capital project development. Tyree received her bachelor’s degree from the University of Illinois-Chicago and her MPA with an emphasis on health care from American Public University.

She has led a number of state and local boards and commissions, and is a past president of the Community Behavioral Healthcare Association of Illinois.


Janette A. Heath, MA, NCC, LCPC – Vice President of Clinical Excellence Janette A. Heath, MA, NCC, LCPC – Vice President of Clinical Excellence

Janette Heath oversees quality management, clinical training, implementation of evidenced-based clinical models, and measurement of clinical outcomes for clients. She has more than 20 years of experience at Centerstone and its legacy organizations in assessment, crisis, community-based services, counseling and administration in Illinois. She received her BS in psychology with a minor in sociology from Culver-Stockton College and her MA in human development counseling with an emphasis in community counseling from the University of Illinois-Springfield. She is a member of Chi Sigma Iota, the National Honor Society for counseling professionals.


Jean Alstat, MSEd, QMHP – Clinical Director Jean Alstat, MSEd, QMHP – Clinical Director

Jean Alstat serves as Clinical Director for behavioral health, community and prevention services in the Carbondale, Marion and West Frankfort offices in Illinois. In this role, she oversees a variety of services including Prevention, Early Head Start, Community Outreach, Early Intervention and Family Services.

Alstat received her MSEd in Educational Psychology with a specialization in Community Counseling. She has the National Counselor Certification and has worked for Centerstone and its legacy organizations for 20 years. She is a long-term resident of Jackson County.


Dalus Ben Avi - Director of Marketing and Community Engagement Dalus Ben Avi - Director of Marketing and Community Engagement

Dalus Ben Avi serves as Director of Marketing and Community Engagement in Illinois. In this role, she develops and implements new strategies for marketing, community outreach and both internal and external communication campaigns. She also promotes and advances Centerstone’s mission and serves as liaison to legislators on key issues.

Ben Avi received her bachelor’s of science degree from Southern Illinois University Carbondale and her master’s of science in organizational leadership from Argosy University.


Helen Blackburn, MS, LCPC – Director of Vocational & Residential Services Helen Blackburn, MS, LCPC – Director of Vocational & Residential Services

Helen Blackburn is Director of Vocational & Residential Services in Illinois. In this role, she oversees residential and vocational programming for individuals with intellectual or developmental disabilities and/or mental health needs.

Blackburn received her MS in Rehabilitation Counseling from Southern Illinois University. She is a qualified intellectual disabilities professional (QIDP) and a licensed clinical practicing counselor (LCPC). She has worked for Centerstone and its legacy organizations for a combined 11 years. She resides in Carbondale.


Emily Dellamano, LCSW - Director of Quality Improvement Emily Dellamano, LCSW - Director of Quality Improvement

Emily Dellamano is the Director of Quality Improvement in Illinois. In this role, she provides day-to-day Quality Improvement oversight to programs and staff. She is also involved in ensuring that the organization is adhering to all certification, licensure and accreditation standards.

Dellamano received her Masters of Social Work from Southern Illinois University-Edwardsville. She has worked for Centerstone and its legacy organizations since 2009. She was born and raised in the Alton area and resides in Madison County.


Kimberly Fleck, PHR, SHRM-CP – Regional Human Resources Director Kimberly Fleck, PHR, SHRM-CP – Regional Human Resources Director

Kimberly A. Fleck, Regional Human Resources Director, has worked for Centerstone and its legacy companies in Illinois for more than 30 years. Fleck has experience in support services, administration and human resources over the course of her career. She began working in human resources specifically in 1998 and was promoted to director in 2012.

She was certified as Professional in Human Resources (PHR) in 2009 and as a Society for Human Resource Management-Certified Professional (SHRM-CP) in 2015. She is a long term resident of Franklin County.


Jessica Harman, RN – Director of Behavioral Health Nursing Jessica Harman, RN – Director of Behavioral Health Nursing

Jessica Harman is the Director of Behavioral Health Nursing in Illinois. In this role, she is responsible for the organization and management of nursing services and medication assisted treatment (MAT) services state-wide. She also provides direct supervision of the nursing staff.

Harman received her nursing diploma from Lutheran School of Nursing in south St. Louis and her BSN from Central Methodist University. She has worked in behavioral health for more than five years. With Centerstone, she has experience assisting with medication monitoring, completing MAT assessments, administering MAT medications and helping coordinate most medication.


Rebecca Hudzik - Clinical Director Rebecca Hudzik - Clinical Director

Rebecca Hudzik, LCPC, currently serves as a Clinical Director for Centerstone in Alton, Ill. In this role, she oversees office and community-based clinical services, as well as residential programming.

She has been with Centerstone and its legacy organization for over 10 years in residential, community-based, quality improvement and administration in the behavioral health field.

She received her master’s degree in professional counseling from Lindenwood University.


Megan Klaas - Operations Director Megan Klaas - Operations Director

Megan Klaas is Operations Director in Illinois, overseeing the grievance and Office of Inspector General (OIG) processes, statewide credentialing, health and safety functions, and the credentialing and operations support staff. Klaas supports and guides the operation team’s budgeting processes, as well as organizes and monitors the submission of state required reporting.

She previously served as Credentialing System Manager at Centerstone from March 2017. Klaas plans to work toward obtaining the Certified Provider Credentialing Specialist certification.


Stacey Overturf, BA – Regional Finance Officer Stacey Overturf, BA – Regional Finance Officer

Stacey Overturf serves as Regional Finance Officer in Illinois. In this role, she oversees the organization’s fiscal operations, supervising finance and revenue cycle staff. Overturf received her BA in accounting from Southern Illinois University-Carbondale. She has worked in finance for Centerstone and its legacy organizations for more than 30 years. She is a long-term resident of Franklin County.


Andrea Quigley, PhD, LCPC - Clinical Director Andrea Quigley, PhD, LCPC - Clinical Director

Dr. Andrea Quigley serves as Clinical Director for the Medication Assisted Treatment (MAT), Grant to Benefit Homeless Individuals (GBHI), and Centerstone Trauma, Treatment, and Training (CT3) grants, mental health and substance use treatment services for the Carbondale, Carterville, Marion, West Frankfort, and Anna outpatient offices, Halfway House federal and non-federal residential treatment program in Marion, and Fellowship House Campus inpatient detox and residential substance use disorder treatment facility in Anna.

Quigley earned a doctoral degree in psychology through the Brain and Cognitive Sciences (BCS) program at Southern Illinois University-Carbondale.


Deniece Shivers - Housing and Facilities Director Deniece Shivers - Housing and Facilities Director

Deniece Shivers serves as the Housing and Facilities Director in Illinois. In this role, she manages the facilities and permanent housing offered by Centerstone in Alton.

Shivers received her BS in Business Management from the University of Phoenix in St. Louis. She also received her Assisted Housing Manager Certification for HUD housing. She has held multiple roles for Centerstone and its legacy organizations for over 20 years.


Chrissy Wedel – Director of Customer Experience Chrissy Wedel – Director of Customer Experience

Chrissy Wedel serves as Director of Customer Experience in Illinois. In this role, she works to improve customer service, supervises customer experience specialists, serves on an enterprise customer improvement team, works with the customer experience sub-group affiliated with the board of directors and acts as the team lead for customer experience in numerous special projects.

Wedel started working in customer service in 1996 and has been with Centerstone since 2007.


  • Illinois Board Members Back to top
  • Carol Zwick, Chair
  • Tom Johnson, Immediate Past Chair
  • Pastor Robert Phillips, Vice Chair
  • Stephani Meyer, Secretary
  • Bonnie Brackett
  • John Markley, CEO
  • Ronda Dunn, PhD
  • Jonette Eagles
  • Patricia Fischer
  • Kim Kaytor
  • David J. Melby, PhD
  • Waverly Robinson
  • Ginger Meyer

View all Centerstone Board Members

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