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.

Dieter Affeln, MD, MPH

Medical Director


Dr. Affeln lends his vast experience in occupational medicine, as a Medical Director to OEHN clients in a variety of settings including hospital employee health, biotechnology, corporations and law enforcement. Dr. Affeln currently serves as the Medical Director for the Boston Police Department.

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. 

Stefan C. Muzin MD

Consulting Specialist in Physical Medicine and Rehabilitation


Dr. Muzin lends his expertise in physical medicine and rehabilitation to OEHN clients by providing clinical consultation, care and treatment of complex musculoskeletal cases in employee health settings. He also provides chart/peer review services for appropriateness of medical care, disability determinations and treatment recommendations. 

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.

Terry B Snyder, BSBME, MBA

Senior Ergonomics Consultant


Ms. Snyder has provided ergonomic consulting services for OEHN clients for over a decade, helping companies develop effective, sustainable ergonomics programs to decrease injury and discomfort, and improve productivity. 

Cynthia Causbie, CCM, CWP, CWWS

Health and Wellness Consultant

Cynthia Causbie and her company CC Wellbeing, Inc. joined the OEHN team to assist our clients in tailoring integrated programs to meet their unique health and wellness needs.

Milda Walkley, RN, BA, CCM, CDMS, COHN-S

Senior Program Manager

Ms. Walkley develops and manages occupational health programs for clients, in accordance with their needs, both remotely and onsite.  She has also developed and administered occupational health and medical surveillance programs in university and private lab research settings for researchers and allied staff in biosafety levels 1 to 3.  She participates on institutional Biosafety Committees, AAALAC accreditation preparation and other safety and regulatory committees.

Donna Baker

Operations Manager

Donna joined the OEHN team in 2012.  She is responsible for overall office operations including accounting, client billing, accounts receivables/payables, payroll, financial reporting and benefits administration. 

Shelly Herbst

Administrative and Disability Coordinator

Shelly coordinates OEHN’s disability management program, interfacing with insurance companies, assigning disability and UR cases to providers in our multi-specialty network and ensuring a timely response. She also schedules and supports the psychological pre-placement and fitness for duty evaluations program.

Occupational & Environmental Health Network

Tel: 508.251.7260 | Fax: 508.251.7265


© 2020 OEHN