Florida Leadership Team and Board Members | Centerstone
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Melissa Larkin-Skinner, MA, MBA, LMHC – Regional Chief Executive Officer Melissa Larkin-Skinner, MA, MBA, LMHC – Regional Chief Executive Officer

Melissa Larkin-Skinner is the regional chief executive officer serving Florida. Overseeing all inpatient and outpatient services and programs, she is responsible for significant organizational growth since becoming CEO, expanding Centerstone’s presence from three to six counties.

As a licensed mental health counselor with 25 years of experience in all aspects of behavioral health, Larkin-Skinner has worked with children and adults of all ages in diverse treatment programs including inpatient, outpatient, crisis intervention, intensive community-based and child welfare. She has designed and operated innovative programs to meet community needs, including the first children’s Community Action Team (CAT) in 2004. CAT has been adopted as Florida’s statewide model serving youth who are struggling with severe mental health, behavioral and co-occurring disorders, along with their families.

A persistent voice bringing attention to the opioid epidemic, Larkin-Skinner is an authority on the disease of addiction and its devastating effects on communities. She regularly provides state and federal policy feedback and engages in legislative advocacy as a subject-matter expert in Tallahassee and Washington, D.C. She has led Centerstone in the rapid expansion of treatment services for individuals fighting opioid addiction, including Medication Assisted Treatment (MAT) in hospital, clinic and jail-based sites. In August 2016, she received the Florida Alcohol and Drug Abuse Association Administrator of the Year for her efforts toward combating the opioid epidemic. Larkin-Skinner currently serves as the only behavioral health provider on the Marjory Stoneman Douglas High School Public Safety Commission.

She received an MBA in Healthcare Administration from Saint Leo University and an MA in Rehabilitation Counseling from the University of South Florida. She serves on Centerstone’s Executive Cabinet, contributing to enterprise mission, vision and growth.


Roger Johnson – Regional Chief Operating Officer Roger Johnson – Regional Chief Operating Officer

Roger Johnson is the Regional Chief Operating Officer for Florida. He is responsible for operations including medical, outpatient and residential services. In addition, he oversees facility management and implements strategies for quality care delivery and growth.

Roger began his career with Centerstone in 1994 as a part-time behavioral health technician. Over the years he has moved up through the organization working on the fiscal side as the manager of accounts payable and receivable, as well as contract management, and on the clinical side as the Director of Medical Services. Roger has been instrumental in the development of new programs including our satellite office in Sarasota, our clinical programs within the Sarasota and Manatee County jails and Centerstone’s psychiatric residency program.

Roger currently serves on the Lake Erie College of Osteopathic Medicine Board of Directors.

He has a BA in business management and has lived in the Bradenton community for more than 50 years.


Sean Gingras – Regional Finance Officer Sean Gingras – Regional Finance Officer

Sean Gingras is Regional Finance Officer in Florida. After college, Sean began as an audit intern for a big five accounting firm and within three years became an audit supervisor at a local firm. In 2007, he became a Certified Public Accountant (CPA). Sean joined Centerstone as the Director of Finance in early 2010.

Sean is a current member of the American Institute of CPAs, the Florida Institute of CPAs, the Government Finance Officers Association, the Florida Government Finance Officers Association, the Healthcare Financial Management Association and the Manatee Young Professionals. He is also a current finance committee member for the Humane Society of Manatee County, a finance committee member for the Central Florida Behavioral Health Network and a board member of the Pinnacle Plaza Condo Association.

He studied accounting at both the University of Florida, where he received a BA, and at the University of Central Florida, where he received his MBA in accounting.


Adina Bridges – Director of South Florida Practices Adina Bridges – Director of South Florida Practices

Adina Bridges is Director of South Florida Practices for Centerstone. She oversees multiple intensive outpatient programs encompassing Lee, Hendry/Glades and Sarasota Counties.

Bridges began her career with Centerstone as a volunteer, completing groups within the Manatee County drug court program. Following continued study and internship, she transitioned to a therapist role for Mental Health Court and was promoted to Supervisor over Comprehensive treatment court. Bridges currently presides over Florida Assertive community treatment teams (FACT), Community Action teams (CAT), Assisted Outpatient treatment (AOT) and Lee Mental health court.

Bridges is a licensed clinical social worker and certified Mental health first aid instructor. She holds a Master’s degree in Clinical Social work and a Bachelor’s degree in behavioral healthcare with concentrations in both applied behavior analysis and adult community services from the University of South Florida. She is a frequent speaker on topics related to mental illness, available recovery techniques and treatment strategies.


Charles Whitfield, M.Ed., CLC – Vice President, Community Care Charles Whitfield, M.Ed., CLC – Vice President, Community Care

Charles Whitfield, M.Ed., is a certified life coach and Vice President of Community Care in Florida.

He graduated with a BA in business administration and an MA in elementary education from Temple University in Philadelphia.

Charles has been working for Centerstone since 2008, managing multiple programs including adult and child med clinics, targeted case management, forensic case management, adult and child therapy services including school-based therapy, child trauma services, rape crisis adult therapy, child advocacy trauma services, prevention and intervention programs. All operations for the outpatient front desk, Call Center, Walk-in Center, Access Center and mobile crisis services are under Charles’ management.

He also manages Centerstone’s community paramedicine program and the Employee Assistance Program (EAP).


Gemma Clayson, MSCP, LMFT – Director of Community Programs Gemma Clayson, MSCP, LMFT – Director of Community Programs

Gemma Clayson is Director of Community Programs. With Centerstone since 2009, she has been working to help those with mental health and substance abuse issues for more than 15 years.

Clayson started with Centerstone as a counselor with the children’s Community Action Treatment (CAT) team. After obtaining her license in marriage and family therapy, Clayson was named Supervisor of the CAT team in Manatee County. From there, she went on to manage three CAT Teams covering Manatee, Sarasota, and Desoto Counties. Clayson currently serves as Director of Children’s Community Programs, managing CAT teams in Manatee, Sarasota, Desoto, Hendry, Glades and Lee County as well as the Child Welfare Diversion Program in Manatee County. In this role, she participates on several community workgroups and boards.

Clayson has a BA in Psychology, an MS in Counseling Psychology and a License in Marriage and Family Therapy.


Jessica Crosby Sullivan, PsyD — Director of Centerstone Jessica Crosby Sullivan, PsyD — Director of Centerstone's Certified Community Behavioral Health Clinic

Jessica Crosby Sullivan, PsyD is Director of Centerstone’s Certified Community Behavioral Health Clinic (CCBHC), a grant funded program that delivers a comprehensive range of mental health and substance use disorder services to vulnerable individuals. She leads a team of clinicians and support specialists in coordinating evidence-based mental health care with physical health care that includes 24-hour crisis care services.

An 18-year veteran in the behavioral health field, Dr. Sullivan is founder of Crosby Counseling Center where she has practiced,for four years, specializing in addictions therapy and wellness counseling.

Dr. Sullivan has a PsyD in clinical psychology and a master of arts degree in clinical psychology from Argosy University. She received a bachelor of arts degree in psychology and biomedical science from the University of South Florida.

She served as President of the Board of Directors for the Postpartum Society of Florida (PPSF) and is a member of Postpartum Society International (PSI), American Psychological Association (APA) and Anxiety and Depression Association of America (ADAA).


Jane Roseboro, MA, MCAP – Vice President of Community Alignment Jane Roseboro, MA, MCAP – Vice President of Community Alignment

Jane Roseboro is Vice President of Community Alignment at Centerstone. With Centerstone since 2009, Jane has been working to help those with mental health and substance abuse issues for more than 18 years.

She started with Centerstone as a counselor in the children’s substance abuse and mental health program. After less than a year, she was promoted to supervisor over the children’s substance abuse program to include outpatient counseling and prevention services and the Manatee County Drug Court Program. As Centerstone continued to grow, she began managing all of the new Centerstone treatment courts in Sarasota County. Jane was then promoted to Director of Forensic Services, where she oversaw the drug court and jail programming in Manatee and Sarasota counties, the Comprehensive Treatment Court Jail Diversion Program in Sarasota, homeless and forensic outreach in Manatee County and integrated care at the Department of Health in Sarasota and North Port.

As Vice President of Community Alignment, Jane added the four FACT teams in Manatee, Sarasota and Lee counties to her oversight. She serves on several community workgroups and boards, forensics and integrated care, focusing on growth of programs.

Jane has a BA in psychology and a MA in sociology with dual concentrations in addiction and family.


Marilyn Agee, RN, BSN – Director of Nursing Marilyn Agee, RN, BSN – Director of Nursing

Marilyn Agee is the Director of Nursing at Florida’s mental health and addiction hospital. She has 27 years of experience with Centerstone in supervising nursing care for adults, children and families seeking mental health and addictions services.

Marilyn received a BS in nursing from Millikin University and certified as a master manager in 1995.


Michelle Abercrombie, Facilities Director Michelle Abercrombie, Facilities Director

Michelle Abercrombie is the Facilities Director in Florida. She directly oversees the maintenance, housekeeping, dietary and transportation departments. She is also responsible for the entire physical plant operation, as well as all of Centerstone’s outpatient facilities. Her priorities are maintaining a safe, secure and healing environment for clients and staff, as well as keeping Centerstone audit-ready for all agencies.

Michelle also serves as the safety officer and chairperson of the Environment of Care Committee, dedicated to identifying and resolving safety issues for staff and clients and conducting internal drills. She also represents Centerstone on the ESF8, Manatee County Emergency Operations Center, and Organizations Active in Disaster. She has studied at Manatee Community College, Texas A&M Engineering, Department of Homeland Security, and FEMA, and has been certified with Emergency Management Institute, completing ICS 100 for health care and hospitals.

Michelle grew up in Manatee County, working in the community for over 25 years with Volunteers of America, as owner/operator of Abercrombie Painting LLC. and with her family’s businesses, which included landscape architect and design.


Robert Boxley, Ph.D. – Director of Clinical Training Robert Boxley, Ph.D. – Director of Clinical Training

Bob Boxley is the Director of Clinical Training for Florida’s psychiatry residency and doctoral psychology programs. He has been involved with the training of the next generation of doctors since 2001; nearly 200 doctors have received training under Dr. Boxley since that time.

Dr. Boxley has a Ph.D. in clinical psychology and has been licensed as a psychologist for 20 years. During that time, he has worked with adults, children and adolescents in a variety of behavioral health areas. Prior to becoming a psychologist, he worked as a therapist in hospital and clinic settings for 17 years, working predominantly with children, adolescents and young adults. Dr. Boxley has a number of professional and research interests, including trauma, co-occurring disorders, positive psychology, childhood disorders.

To learn more about the Centerstone Consortium Doctoral Internship in Psychology, please click here.


Samantha Kolb, LCSW – Vice President, Quality and Innovation Samantha Kolb, LCSW – Vice President, Quality and Innovation

Samantha Kolb is Vice President of Quality and Innovation in Florida. She graduated from Florida State University with both a BA and an MA in social work.

Samantha is a licensed clinical social worker with nearly 12 years of experience in behavioral health. Specializing in addictions treatment, she has managed the adult addiction continuum that includes inpatient, residential, outpatient, medication-assisted treatment, HIV and community-based family programs.

Now focused on quality improvement and risk management initiatives for Centerstone, Samantha is focusing her efforts on medical record/health information processes and technology, and utilization review practices. Sam will continue oversight of outpatient addiction services, inpatient and residential addiction treatment, and family addiction services.


Suzanne Santangelo – Director, Marketing and Business Development Suzanne Santangelo – Director, Marketing and Business Development

Suzanne Santangelo is the director of marketing and business development in Florida. She develops and executes strategic communication and marketing plans that influence brand awareness and referral source goals. With extensive experience in healthcare marketing, public relations and community outreach, she focuses on relationship development and operational enhancements that further Centerstone’s mission.

Santangelo received a BA in mass communications from the University of South Florida and an MBA in Healthcare Management from Western Governors University.


  • Florida Board Members Back to top
  • Jennifer Bencie, MD, Chair
  • Rev. James Golden, Vice-Chair
  • Colleen Thayer, Secretary
  • Timothy Knowles, Immediate Past Chair
  • Melissa Larkin-Smith, CEO
  • Linda Agresta
  • Edward Viltz
  • Captain Lorenzo Waiters

View all Centerstone Board Members

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