Executive Leadership

Stuart Koman, Ph.D.

President and CEO
Stuart Koman is the founder, president and chief executive officer of Walden Behavioral Care and its nonprofit Walden Center for Education and Research. Dr. Koman is a veteran health care manager with more than 30 years of experience leading and developing several behavioral health care companies. While all of these companies have become successful businesses under his leadership, Dr. Koman attributes much of this success to another common theme: They have all taken seriously their mission of providing innovative, compassionate and coordinated services to previously underserved populations and families. Walden Behavioral Care is the most recent example as it has quickly become the leading provider of services for individuals with eating disorders in New England through its multilevel, multisite system of care. In the 12 years since its founding, Walden has become a state-of-the-art system of care that has provided treatment services to more than 15,000 patients.

Dr. Koman began his professional career in 1985 when he was appointed senior clinician and then director of adolescent programs at Charles River Hospital (CRH) in Wellesley, Mass. Over the next 10 years , he led two companies in achieving significant clinical and business outcomes. The first company, Charles River Management (CRHM), a subsidiary of CRH, grew out of the work of Dr. Koman and others in developing innovative treatment models for adolescents in hospital settings. Dr. Koman and his colleagues were among the first to recognize the central importance of the family in treatment-program design. Many of these and related ideas were published in the “Handbook of Adolescents and Family Therapy,” in which Dr. Koman wrote several chapters and served as co-editor.

In 1990, Dr. Koman co-founded the managed health care company, Choate Health Systems, Inc. (CHSI). Similar to the approach at Charles River, Choate provided integrated delivery of behavioral health care through a full continuum of treatment services operating under one administration. As this model proved highly adaptive in the emerging world of managed care, Choate expanded rapidly leading to the formation of Choate Health Management, Inc. (CHMI) and Choate Psychiatric Associates, P.C. (CPA). Having successfully managed the transition in health care reimbursement approaches, Dr. Koman was asked to assist the profession of psychology to do the same and subsequently served on the governing board of the American Psychological Association’s practice division from 1992 to 2000.

After leaving Choate in 1995, Dr. Koman started Koman Associates, which focuses on leaders and leadership issues in government, health care and business. At the same time, Dr. Koman served as senior clinical adviser for Public Consulting Group, providing strategic planning and systems re-engineering to state agencies throughout the United States. Dr. Koman continues his involvement with both of these organizations albeit on a much-reduced basis since Walden was established in 2003. Dr. Koman earned his bachelor’s degree from Trinity College and his doctorate from Duke University.

James M. Greenblatt, M.D.

Chief Medical Officer & Vice President, Medical Services
Dr. James M. Greenblatt is chief medical officer and vice president of medical services at Walden. He provides medical management, leadership and oversight of Walden’s eating disorder programs in Massachusetts and Connecticut. Working with thousands of children, adolescents and adults, Dr. Greenblatt found that each individual has a unique biochemical profile, range of behaviors and treatment needs. Dr. Greenblatt is board-certified in child and adult psychiatry. He received his medical degree and completed his adult psychiatry residency at George Washington University in Washington, D.C. He completed a fellowship in child and adolescent psychiatry at Johns Hopkins Medical School. In addition, Dr. Greenblatt is a clinical faculty member in the psychiatry department at Tufts Medical School as well as the Geisel School of Medicine at Dartmouth College in New Hampshire. He lectures extensively throughout the United States and Canada on integrative therapies for mental health. He is the author of six books: Answers to Anorexia (2011), The Breakthrough Depression Solution (2012), Answers to Binge Eating (2014), Integrative Therapies for Depression: Redefining Models for Assessment, Treatment, and Prevention (2015), Nutritional Lithium: The Cinderella Story (2016), and The Breakthrough Depression Solution 2nd eds. (2016). His latest book, Finally Focused, describing integrative therapies for ADHD, will be available Spring 2017.

Paula Vass, MSW, LICSW, MBA

Vice President, Clinical Operations
Paula Vass is vice president of clinical operations. She supervises the admissions and utilization review departments along with inpatient, residential, partial hospitalization, intensive outpatient and outpatient programs. Ms. Vass began her career at Walden in 2005 as the director of social work for the inpatient psychiatric unit and eating disorder unit. Formerly, she was a psychiatric triage clinician at Deaconess Waltham Hospital and a supervisor for the Department of Children and Family Services. In addition, she has managed a private practice in the Waltham area, treating young adults with eating disorders. Ms. Vass specializes in the treatment of eating disorders, utilization management and crisis evaluation. She often presents at community organizations on the diagnosis, etiology and treatment of eating disorders. She graduated from Lasell College with a bachelor’s in human services. She earned her master’s in social work from Salem State University and completed her graduate training at Children’s Hospital Boston. Most recently, Ms. Vass earned her MBA from Bentley College. She has been a member of the National Association of Social Workers since 1997 and received her LICSW designation in 1999.

Charles R. Rossignol, MBA

Vice President, Business Development
Charles Rossignol is vice president of business development at Walden and is responsible for identifying, developing and managing all business expansion projects for the organization. During his tenure, Mr. Rossignol has opened and expanded several licensed outpatient clinic sites, with additional sites under development in Massachusetts and Connecticut. Before coming to Walden, Mr. Rossignol served in a number of executive and administrative roles with other Massachusetts-based behavioral health care providers. Most recently, he was chief executive officer at Arbour-HRI Hospital, a private psychiatric hospital in Brookline, part of the Arbour Health System of psychiatric hospitals in Massachusetts. Key accomplishments included reversing prior annual operating losses and generating continually improving financial performance and profitability through increases in admissions, improvements in payer mix and reductions in bad debt. Formerly, Mr. Rossignol was the group vice president at Pioneer Behavioral Health, overseeing behavioral health services in Connecticut and New York. Key accomplishments included improved financial performance through increases in service contracts and agreements and cash collections, reductions in bad debt and better staff productivity. Prior to this role, he was the executive director \ director of operations at Choate Health Systems and Choate Health Management. Key accomplishments there included the planning and opening of BayRidge Hospital in Lynn, Mass. He also oversaw the development and management of Choate’s statewide service agreements for precertification and evaluation services for the state’s two largest insurance payers as well as the launching of Choate’s first outpatient provider network. Throughout his career, Mr. Rossignol has also served as a consultant on a number of projects for several local and regional private psychiatric hospitals and human service organizations, in areas of Joint Commission accreditation, quality assurance and improvement, operations / financial performance and improvement. Mr. Rossignol earned his master’s in business administration from Northeastern University and his bachelor’s in psychology from Framingham State University. He is affiliated with the American College of Healthcare Executives.