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Thomas H. Winters MD, FACOEM, FACPM

President, Chief Medical Officer and Principal Partner


With over thirty years of experience in Occupational Medicine and an entrepreneurial spirit, Dr. Winters cofounded OEHN in 2004. As President and Chief Medical Officer of OEHN, he provides clinical oversight of physicians and is Medical Director for clients from a wide spectrum of industries.

Lee Okurowski, MD, MPH, MBA

Chief Executive Officer, Chief Financial Officer and Principal Partner


Dr. Okurowski has extensive background in prevention and disability research, including identification of risk prediction models for work-related back pain to improve quality of care and reduce costs.

Karin Sullivan, M.Ed.

Executive Director


Karin’s role at OEHN is to provide administrative leadership and oversight of the daily business functions, including operations, human resources, financial, business development, client relations, communications, project management, new client program development, and strategic planning.

Deborah N. Barbeau MD, PhD, MSPH

Medical Director


As Medical Director, Dr. Barbeau combines her extensive Infectious Disease background with Occupational Medicine, benefitting clients including academic hospital employee health departments, community occupational health clinics, as well as university research occupational health programs and biotechnology and biopharma companies. 

David Rosmarin, MD

Chief of Psychiatric Services


Dr. Rosmarin has over 30 years’ experience in criminal, civil and occupational matters in Forensic Psychiatry. Dr. Rosmarin served his internship at Boston City Hospital.  He went on to a residency at the University of Massachusetts Medical Center where he was Chief Resident in Forensic Psychiatry.  He was also a special student at Harvard Law School.

Michael Amster, CIH, CSP, PE, CHMM, TURP

Environmental Health and Safety Specialist


Mr. Amster has provided consulting services to OEHN clients since 2004 including innovative, cost effective solutions to various types of EH&S issues to maintain employee safety, proper operations and regulatory compliance.

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