Executive Leadership Team

Leadership Teams

Maine Behavioral Healthcare operates under the guidance of three primary leadership bodies:


Strategy Team

The MBH Strategy Team is made up of the Maine Behavioral Healthcare CEO, Spring Harbor Hospital President, Chief Financial Officer, Senior Vice Presidents, and the Chief of Psychiatry.

Stephen Merz

Stephen M. Merz, FACHE

President & Chief Executive Officer

Stephen Merz, FACHE, the President and Chief Executive Officer of Maine Behavioral Healthcare, has more than 20 years of experience as a healthcare executive. Previously he was the Vice President and Executive Director of Behavioral Health at Yale New Haven Hospital in Connecticut, one of New England’s largest hospitals.

Starting as an administrative fellow in 1995, he assumed ever-increasing responsibilities over more than 20 years in New Haven becoming vice president and executive director of behavioral health. He undertook a number of initiatives to help transform and integrate mental health care into the larger system and the community, including programs that brought mental health care into other medical services and setting up transitional support for patients returning home.

Stephen holds a master’s degree in Health Services Administration from the University of Michigan School of Public Health and a bachelor’s degree from Cornell University.


Michael Abbatiello

Michael Abbatiello, MPPM, CPA

Senior Vice President of Operations and Finance

With over twenty-seven years of experience in healthcare finance, Michael R. Abbatiello, CPA, MPPM is the Chief Financial Officer of Maine Behavioral Healthcare managing the areas of Finance, Patient Accounts, Supply Chain, Practice Management, Health Information Management, Revenue Cycle, Information Services and Facilities Management. Michael has taken the lead in negotiating behavioral health commercial insurance agreements on behalf of MaineHealth, leveraging the strategic advantages of our entire Behavioral Health Service Continuum.

Michael is a Certified Public Accountant and holds a Master's Degree in Public Policy and Organizational Management from the Muskie School of Public Service where he developed longitudinal research on the financial vulnerability of Maine's social service sector. Taking an active role in Augusta, Michael advocates for financial and policy matters that impact behavioral health resources across the MaineHealth system. His entrepreneurial spirit and focus on customer service comes from a history of a family-run business where he learned the benefits of investing in a positive customer experience.


Katie Fullam Harris

Katie Fullam Harris

Senior Vice President, Government Relations and Accountable Care Strategy, MaineHealth

Katie Fullam Harris serves as Senior Vice President of Government & Relations and Accountable Care Strategy for MaineHealth, Maine’s largest health care system. She works with policymakers and employers to shape and respond to public policy and market changes, and she leads efforts to develop new system initiatives that support MaineHealth’s accountable care goals. Prior to joining MaineHealth, Katie was the Director of Government Relations for Anthem Blue Cross and Blue Shield in Maine. She has also served as a program director for the Maine Development Foundation and as Assistant to the Commissioner for the Maine Department of Mental Health, Mental Retardation and Substance Abuse Services.

A native of Maine, Katie has an MS in Health Care Policy and Management from the Muskie School at the University of Southern Maine, and a BA from Columbia University. She is an active triathlete and runner, and she and her husband live in Cumberland with their 2 dogs.


Mary Jane Krebs2

Mary Jane Krebs, FACHE

Senior Vice President of Intensive Services
President of Spring Harbor Hospital

Mary Jane Krebs, FACHE, is the President of Spring Harbor Hospital and Senior Vice President of the Intensive Service Line at Maine Behavioral Healthcare. She is leading the priority of safe patient flow and lowering lengths of stay for adult patients at Spring Harbor, as well as cultivating employee engagement across the Maine Behavioral Healthcare system to attract and retain the best professionals in the field.

Previously, Mary Jane was the CEO of Community Counseling Center, now also part of Maine Behavioral Healthcare; Chief Clinical and Nursing Officer at Spring Harbor and Maine Medical Center’s Department of Psychiatry; and Vice President of Clinical Services at Jackson Brook Institute. Mary Jane completed her undergraduate nursing degree at the College of New Jersey and graduate degree at New York University.

She is a fellow in the American College of Healthcare Executives, a steering committee member of the National Association of Psychiatric Health Systems, serves on the Southern Maine Area on Aging Board of Trustees, the Maine Hospital Association Board of Directors and chairs the MHA Mental Health Council.


Patrick Maidman

Patrick Maidman, MD

Medical Director for Ambulatory Services

Patrick S. Maidman, MD is the Medical Director for outpatient psychiatry at Maine Behavioral Healthcare. He comes from a family of doctors and was fortunate to have guidance on his path to medical school. Dr. Maidman graduated from New York Medical College, where he also completed his residency and a fellowship in child and adolescent psychiatry.

As soon as he started to work with people, he understood that psychiatric care was at the root of all good care. He immediately understood this foundational element of becoming a healing professional, and his calling was clear.

After finishing his training in child, adolescent, and adult psychiatry, Dr. Maidman began working in community healthcare. His philosophy is to treat people the same way you would want any family member to be treated, and as close to home as possible.


Robert McCarley

Robert McCarley, MD

Vice President of Medical Affairs for Intensive Services

Robert V. McCarley, MD is the Vice President for Maine Behavioral Healthcare Medical Affairs for Intensive Services including Crisis, Assertive Community Treatment (ACT), contracted services at Southern Maine Healthcare and Pen Bay Medical Center, and at Spring Harbor Hospital.

Dr. McCarley has practiced in Maine for 14 years, working for 10 years at MMC in the outpatient psychiatry Partial Hospital Program, and as the Outpatient Psychiatry Residency Coordinator. He subsequently became the Medical Director of Spring Harbor Hospital, which merged with Maine Behavioral Healthcare.

He trained at the Harvard Longwood Psychiatric Residency Training Program, Brigham & Women's Hospital, Beth Israel Deaconess Medical Center, and Massachusetts Mental Health Center in Boston. He graduated from the George Washington Center School of Medicine in Washington DC.

Dr. McCarley has five children, and enjoys skiing, walking in the woods with his dog, and living with his family and community in Maine.


Robyn Ostrander

Robyn Ostrander, MD

Medical Director for the MMC Division of Child & Adolescent Psychiatry

Dr. Ostrander graduated summa cum laude from Smith College with a bachelor’s degree in psychology. She received her medical degree from Harvard Medical School and completed an internship and residency in adult psychiatry and a fellowship in child and adolescent psychiatry at Dartmouth Medical School. She is board-certified by the American Board of Psychiatry & Neurology in both psychiatry and child and adolescent psychiatry.

Dr. Ostrander joined Maine Medical Center and Maine Behavioral Healthcare in 2016. She serves as both interim chief and associate chief of the Department of Psychiatry at Maine Medical Center, as well as medical director of the Division of Child & Adolescent Psychiatry at Maine Medical Center. She also serves as chair of the Glickman Family Center for Child & Adolescent Psychiatry at Spring Harbor Hospital. She previously served as senior medical director for the Brattleboro Retreat in Brattleboro, Vermont, and as director of the Leaders Developing Leaders Program there. Dr. Ostrander is an assistant professor of psychiatry at Tufts University School of Medicine and a faculty member for the MaineHealth Physician Leadership Development Fellowship. She co-authored a textbook on behavioral neuroanatomy in 2009 and lectures actively on suicide prevention and provider wellness. She is a frequent guest on the Maine Calling program on Maine Public Radio. She has also been active as a professional executive leadership coach with Linkage Inc. to individuals and teams since 2011.


Matthew Siegel

Matthew Siegel, MD

Vice President of Medical Affairs, Autism and Developmental Disorders Services

Matthew S. Siegel, MD is the Vice President of Medical Affairs, Autism and Developmental Disorders Services at Maine Behavioral Healthcare, Associate Professor of Psychiatry and Pediatrics at Tufts University and Faculty Scientist at the Maine Medical Center Research Institute. His educational background includes undergraduate studies at Amherst College followed by Stanford Medical School, and training at Brown University in child psychiatry and pediatrics. He is nationally recognized for his expertise in systems of care and research for children with autism, intellectual disability and co-occurring emotional and behavioral disorders.


Operations Council 

This key leadership group was formed to enhance and streamline communication between our organizational leaders, primarily focusing on operational issues. The Council meets weekly to review safety events, critical incidents, announcements, program dashboard review, in addition to a rotating cycle of weekly topics in four key areas:

  1. Inpatient/Intensive Services,
  2. Ambulatory/Integrative Services,
  3. Safety/Quality, Performance Improvement, and
  4. Corporate/Financial services and People & Culture

Medical Staff Leadership Council

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This team of clinical leaders includes members of the Strategy Team, and our medical staff leaders. The purpose of the council is to provide overall clinical direction for MBH, including new program development, and oversight of key quality/value metrics, and clinical leadership.