LEADING THE WAY

EXECUTIVE MANAGEMENT TEAM

Michelle Schafer, MS, CEAP, LMHC
Michelle Schafer, MS, CEAP, LMHC
Chief Executive Officer
Andrea Westerfield, MSSW, LMSW, LCSW
Andrea Westerfield, MSSW, LMSW, LCSW
Chief Operating Officer
David Wilson, MBA, CPA
David Wilson, MBA, CPA
Chief Financial Officer and Chief Development Officer
Mark Wisniewski, MBA
Mark Wisniewski, MBA
Chief Information Officer, Chief Data Officer
Keisha Greene, MBA, BSN, RN, CPHQ, CEHRS, CPHRM, CHC
Keisha Greene, MBA, BSN, RN, CPHQ, CEHRS, CPHRM, CHC
Compliance Officer and Vice President of Quality
Mohsin Ali, MD, DEA
Mohsin Ali, MD, DEA
Medical Director
Ruth vanBergen, MBA, MSEd, LPC
Ruth vanBergen, MBA, MSEd, LPC
Senior Vice President, Emergency Services
Kenya Adams, MHA
Kenya Adams, MHA
Vice President, Integrated Care
Kate Westergard, MEd 
Kate Westergard, MEd 
Vice President, Administration
Melanie Mummert, SPHR
Melanie Mummert, SPHR
Vice President, Human Resources
Brittany Greene, MA
Brittany Greene, MA
Vice President, Judicial Services
August White, MEd, LPC/MHSP
August White, MEd, LPC/MHSP
Executive Director, West

Michelle Schafer, MS, CEAP, LMHC 

Chief Executive Officer

Andrea Westerfield, MSSW, LMSW, LCSW

Chief Operating Officer

Andrea Westerfield serves as Chief Operating Officer where she directs, oversees and supports all of MHC’s operating activities.

She joined MHC in 2008 as a Child and Youth Care Manager. She quickly transitioned to supervisory, and eventually senior leadership roles, where she was instrumental in shaping MHC’s Community-Based Care Management model. She also served as MHC’s Vice President of Integrated Care, where she led operations of clinical outpatient treatment across behavioral health, physical health, and addiction service lines. She is well respected for building consensus, aligning forces and leading teams to success.

Andrea received her Bachelor’s Degree in Social Work from Murray State University  and her Master’s Degree in Social Work from the University of Tennessee. She is a Licensed Clinical Social Worker in the state of Tennessee.

David Wilson, MBA, CPA

Chief Financial Officer and Chief Development Officer

David Wilson serves as Chief Financial Officer responsible for all financial operations of the organization. David also serves as Chief Development Officer and oversees the financial feasibility of new opportunities for MHC. David brought a wealth of experience to MHC in 2014 in community-based healthcare, accounting/finance and business intelligence. In 2018, Wilson was named “Nashville Business Journal’s CFO of the Year” for non-profit agencies.

Prior to joining MHC, David practiced accounting with the Nashville based accounting firm Kraft CPAs.  David left public accounting in 2010 and became Director of Finance for SunCrest Healthcare, a private equity owned for-profit home healthcare company.

David left SunCrest in 2014, when the company was sold, and was named CFO of Mental Health Cooperative.  He is a Certified Public Accountant and an Adjunct Professor of Accounting for Belmont University.

David received his Bachelor’s Degree from North Carolina State University and Middle Tennessee State University and his MBA from Belmont University, Jack Massey School of Business.

Mark Wisniewski, MBA

Chief Information Officer, Chief Data Officer

Mark Wisniewski serves as Chief Data Officer and Chief Information Officer responsible for information technology and data strategy.  Mark joined MHC in 2020 with the goal of designing and delivering the next generation of healthcare analytics solutions that will assist clinicians and care managers in providing the highest quality of care to MHC consumers.

Mark has a long history of implementing data-driven population health management solutions that focus on: optimizing chronic condition management, closing gaps in care, improving health status, and reducing unnecessary costs.

Prior to MHC, Mark served as a Healthcare Principal Consultant at InfoWorks.  During that time he worked with large payors, networks and provider groups on data strategy, data integration and data warehouse projects.

Mark received his Bachelor’s Degree from Trevecca Nazerene University and his Master’s of Business Administration Degree from the Owen Graduate School of Management at Vanderbilt University.

Keisha Greene, MBA, BSN, RN, CPHQ, CEHRS, CPHRM, CHC

Compliance Officer and Vice President of Quality

Keisha Greene has over 26 years of experience as a Registered Nurse and in healthcare management. Keisha has considerable experience in the development of policies & procedures, quality management tools, regulatory compliance, and training programs for caregivers and clinic operations managers. She has significant experience in the large-scale multi-site implementation of policies, procedures, and electronic medical records systems.

Keisha holds an MBA with a concentration in healthcare administration. This combination of experience and education positioned her well to provide the corporate level clinical quality program development and clinical regulatory compliance leadership for two large national healthcare organizations during her career. She is a Certified Professional in Healthcare Quality, a Certified Electronic Health Records Specialist, a Certified Professional in Healthcare Risk Management and is Certified in Healthcare Compliance (CHC). Keisha is a systems thinking and process driven leader who strives to consistently operate in excellence.

Mohsin Ali, MD, DEA

Medical Director

Dr. Mohsin Ali joined Mental Health Cooperative in 2014, based out of our Chattanooga office. He served as Eastern Region Medical Director for several years, before becoming Medical Director for the entire organization in 2021. Dr. Ali is board certified in Psychiatry and Child and Adolescent Psychiatry. Trained in Syracuse NY, he has worked in Tennessee for the last sixteen years, in diverse clinical settings– private practice, inpatient psychiatry, corrections, geriatric units, consult-liaison psychiatry in medical settings. But the bulk of his career, interest, and expertise lies in community mental health. He has deep respect for our consumers, enjoys watching their individual journeys unfold. He encourages them to live as fully as possible. From his home in Chattanooga, Dr. Ali enjoys traveling widely, both in person and through his reading of fiction from around the world. He always makes time for family, friends, and nature.

Ruth vanBergen, MBA MSEd, LPC

 Senior Vice President, Emergency Services

Ruth vanBergen serves as Senior Vice President of Emergency Services, where she is dedicated to transforming emergency psychiatric services with a focus on operational excellence, compassionate care and outcomes.

Ruth began her career at MHC in 1998 where she led the development of the state’s first Program for Assertive Community Treatment (PACT), which is still in operation today.  She has also been instrumental in building and nurturing MHC’s care management service, focused solely on persons with serious behavioral health challenges that has matured into one of the largest programs in the state. Ruth previously held the position as Senior Vice President of Operations where she was responsible for all organizational functions, infrastructure and quality of care.

Ruth received her Bachelor’s Degree in Psychology from Arizona State University, her MBA in Health Care Management from the University of Phoenix and a Master’s Degree in Educational Psychology from Southern Illinois University.  She is a Licensed Professional Counselor/Mental Health Service Provider in the state of Tennessee.

Kenya Adams, MHA is Vice President of Integrated Care. Previously, Kenya was Director of our Payor Contracting, Strategy and Development.

Kenya has over a decade of direct experience in clinic operations. She’s held several leadership roles, one of which was with Ascension Saint Thomas Health where she was responsible for an integrated health system of primary care and behavioral health clinics that provided care to the uninsured populations of Davidson, Rutherford, and Humphreys Counties. Kenya is passionate about improving healthcare delivery, optimizing operational efficiency, and ensuring compliance with healthcare regulations. She has a sharp focus on operational excellence, and has successfully implemented process improvements, leveraged technology solutions, and fostered team collaboration to enhance clinic productivity and patient care.

Kenya received a Bachelor’s degree in Sociology/Psychology from the University of New Orleans. She also holds a Master’s degree in Healthcare Administration from Capella University.

Kate serves as the VP of Administration where she provides oversight of the administrative functions and as a strategic partner to executive key agency initiatives. She joined MHC in 2019 as a Project Manager working with the Information Technology team. She was promoted to Director of Project Management to serve the entire agency working on cross functional teams and projects. She has worked to implement various technology solutions, lead process improvement work, and help manage expansion efforts of services and programs. Prior to MHC, Kate worked as a healthcare consultant focused in process improvement, regulation reporting and population health. She received both her bachelor’s and master’s degrees from Vanderbilt University.

Melanie Mummert, SPHR

Vice President, Human Resources

Melanie is our Vice President of Human Resources and is an ICC certified Coach and SPHR certified professional. With over 20 years of experience implementing innovative talent, leadership and learning and OD initiatives that boost productivity and engagement, she drives our people first philosophy to empower our workforce. Before joining Mental Health Cooperative, she spent time driving strategic HR programs in start-ups as well as Fortune 500 organizations.

Brittany Greene, MA

Vice President, Judicial Services

Brittany Greene serves as Vice President of Judicial Services where she has oversight of all judicial services for the organization.

With over 20 years of blended experience in the field of behavioral health, Brittany has combined her clinical background with operational and clinical leadership roles, showcasing a diverse skillset. Notably, Brittany’s experience in behavioral health managed care spans more than a decade. In this capacity, Brittany directed Behavioral Health clinical services, provider relations, contracting operations, and program management. Brittany is recognized among her peers and colleagues as a champion of the collective impact of small things done well – with a passion for developing and implementing best practices based on practical experiences and creative solutions. Most remarkably, Brittany draws inspiration from her early career serving as a case manager in the foster care field. She learned firsthand the profound difference even one person can make in the lives of others, and she continues to draw upon this life lesson throughout her professional journey. Brittany’s leadership style reflects a “walk with you” approach, appreciating the value of the human connection and ensuring that individuals feel heard.

Brittany received her Bachelor’s degree in Psychology from Lipscomb University and her Master’s degree in Counseling Psychology from Trevecca University.

August White, MEd, LPC/MHSP

Executive Director, West

August White serves as the Executive Director in our newly expanded West Division.

She brings with her close to 20 years of clinical and leadership experience. August is a versatile leader that works towards building strong connections and collaborations to meet the very complex needs of our consumers living with mental illness. August prides herself on being a servant leader and has a proven track record of developing strong relationships with stakeholders and consumers.

August received her Bachelor’s and Master’s Degrees in Counseling Psychology from the University of Mississippi. She is a Licensed Professional Counselor/Mental Health Service Provider in the state of Tennessee.

DIRECTORS

Julie Barnes, LCSW
Director, Substance Use Services
Nicole Bates, BSN, MHSA, CPHQ
East Region Director, Development
Shara Biggs, LPC-MHSP, NCCHC CCHP
Director, Criminal Justice Services
John Breeding, MA, AAS
Director, Information Technology
Chad Darling RN, BSN
Director, Nursing
Kendall Elsass, LCSW
Director, Care Management
Jenifer Felts
Controller
Elizabeth Hart, M.S.
Director, Communications
Amanda Hayes, MSN, BSN, RN
Director of Nursing, Emergency Psychiatric Services
Rissa Ivens, MD
Medical Director, Emergency Psychiatric Services
Chandra Krishnasastry, MD
Medical Director, Substance Use Services
Katherine Peters, CPA
Director, Budget & Finance Analysis
Amanda Pollard, BSW, MAT
Director of Learning
Michael Randolph, LPC-MHSP
Director, Emergency Psychiatric Services-Co-Response
Sam Safer
Director, Payor Contracting Strategy and Development
Melissa Tambini
Director, Clinic Operations
Sara Vardell, PsyD
Director, Mental Health Detention Services
Kelly Weaver, BSHCA 
Director, Facilities
Lawrence W. Wilson, RPh
Director, Pharmacy
Evelyn Yeargin, BSW, MS, MSP
Director, Advocacy and Housing

BOARD OF DIRECTORS

Myles MacDonald
Chairman
Lisa Webb
Secretary
Berry Holt
Mickey McKay
Beth Mullins
Jason Ross
Micail Samiere
David Tropauer
Andrea Turner
Jessica Walker