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Senior Medical Leadership Team

Dr. Susan Brien

Vice President Medical, Academic and Research Affairs
Dr. Susan Brien is Vice President Medical, Academic and Research Affairs for Horizon Health Network. Originally from New Brunswick and prior to joining Horizon, Dr. Brien served as the Director, Practice and System Innovation at the Royal College of Physicians and Surgeons of Canada. She played an integral part in the Royal College’s international initiative as the Vice-President Asia Pacific. Her portfolio included overseeing new regional, national and international projects, facilitating professional development activities such as team training, simulation, performance assessment, simulation accreditation, and curriculum integration. Dr. Brien also held leadership roles including Chief of Neurosurgery at Le Centre de santé et de services sociaux de Gatineau, where she had practiced as a neurosurgeon. She served as the inaugural Director of Operations for Quebec, Eastern Canada and Nunavut with the Canadian Patient Safety Institute, where she was responsible for national patient safety education. Dr. Brien is an Adjunct Professor of Surgery at the University of Ottawa and a faculty lecturer with the Division of Neurology and Neurosurgery at McGill University, where she also served as the UGME Accreditation Lead for the Gatineau Campus. She is a certified physician executive and member of the American Association of Physician Leaders. As Vice President Medical, Academic and Research Affairs, Dr. Brien oversees and ensures systems, policies and procedures support excellence in medical care and champions constant improvement, innovation, and research.

Dr. Ken Gillespie

Acting Regional Chief of Staff
Born and raised in Nova Scotia, Dr. Gillespie is a graduate of Dalhousie University in Halifax in 1994 where he finished his residency in 1999. Upon completing his residency, he came to Horizon’s The Moncton Hospital (TMH) to open an obstetrics and gynecology practice, and has been working as an Obstetrician at TMH for approximately 25 years. He has served as the Local Chief of Staff for the Moncton Area, Clinical Department Head for Obstetrics and Gynaecology at TMH, as well as Medical Director for Women and Children's Health at TMH. He has been actively involved in the procurement and planning of the new Maternal Newborn Building, currently under construction at TMH. This new building will be a significant addition to Horizon resources to help the organization better serve both the Moncton community and families from around the province.

Dr. Martha Mills

Chief of Staff, Fredericton area
Dr. Martha Mills received her medical degree and residency training in Obstetrics and Gynecology from Dalhousie University before establishing her Fredericton practice in 2001. A champion of excellence in obstetric and gynecologic care, Dr. Mills is a Fellow of the Royal College of Physicians and Surgeons of Canada (Obstetrics and Gynecology), and a member of the Society of Obstetrics and Gynecology (SOGC) of Canada, American Association of Gynecologic Laparoscopists, and Atlantic Society of Obstetricians and Gynecologists (ASOG). Dr. Mills has held multiple local, provincial and national committee and leadership positions including President of the Specialty Council of the New Brunswick Medical Society, President and Scientific Director of the ASOG, Chair of the Drugs and Therapeutics Committee and Medication Management Committee and member of the Brand Recognition Program for SOGC. From 2005 to 2014, Dr. Mills served as the Department of Obstetrics and Gynecology’s clinical department head for the Fredericton area. An educator and mentor, Dr. Mills received the Carl Nimrod Educator Award in 2016 from the Association of Professors of Obstetrics and Gynecology (SOGC). In addition to her teaching duties with Dalhousie University and Memorial University, she has served as a member of both undergraduate and postgraduate medical education committees, and the Dalhousie Medical School Admissions Committee. In her spare time, Martha can be found on the golf course or spending time with her family, especially her two grandchildren.

Dr. Tom Peters

Medical Director, Fredericton area
Dr. Thomas Peters has been the Medical Director for Fredericton and the surrounding area since 2010. A thoracic surgeon and Fellow of the Royal College of Surgeons of Canada and America College of Chest Physicians, Dr. Peters received his medical degree and general surgery residency training from Dalhousie University in 1972 and 1981, respectively, during which he worked in family medicine in Halifax and Peru. He completed his two-year specialty training in thoracic surgery at Dalhousie University and Exeter University (UK) in 1983 before working as a general and thoracic surgeon in Fredericton from 1983 to 2012. Dr. Peters has held numerous administrative leadership positions, including Chief of General Surgery and Clinical Head of Surgical Program. The former head of the Medical Education Committee, he is an Assistant Professor of Surgery at Dalhousie University.

Dr. Warren Giberson

Chief of Staff, Moncton area
A Fellow of the Royal College of Physicians and Surgeons of Canada (Otolaryngology-Head and Neck Surgery), Dr. Warren Giberson received his medical degree from Memorial University of Newfoundland in 1986 before completing his general surgery and otolaryngology residencies. He returned to New Brunswick in 1991 to open his practice in the Moncton area. Dr. Giberson has held many medical leadership roles, including the Clinical Department Head of Otolaryngology, Director of Surgical Specialties, Medical Director of Surgery and Medical Director Ambulatory Care for the Moncton area. In addition to his clinical and leadership duties, Dr. Giberson teaches medical students and residents and is a clinical instructor for Dalhousie University and a clinical assistant professor for the Université de Sherbrooke. Dr. Giberson is a member of the Canadian Society of Otolaryngology-Head and Neck Surgery and the American Academy of Otolaryngology-Head and Neck Surgery. He has also served as secretary-treasurer and president of the Eastern Canada Otolaryngology Society, and specialty representative for the New Brunswick Medical Society.

Dr. Jody Enright

Medical Director, Moncton area
Dr. Jody Enright has served as Medical Director for Moncton and the surrounding area since January 2018. Dr. Enright has been a family physician in the Department of Family Medicine at Horizon's The Moncton Hospital since 2009 and is a strong advocate for patients and their families, and understands the challenges faced by our patients, clinicians, and health care professionals. Her role as Medical Director focuses on physician recruitment and improving quality care. Born in Moncton, Dr. Enright received all of her university training in Atlantic Canada and has also served as an Assistant Professor with her alma mater, Dalhousie University Faculty of Medicine, since 2011. Before entering the field of medicine, Dr. Enright worked in both the human resources and public relations sectors.

Dr. Sanjay Siddhartha

Chief of Staff, Miramichi area
Dr. Sanjay Siddhartha received his medical degree from Medical College Raipur and is a Fellow of the Royal College of Physicians of Canada in Psychiatry (FRCPC). Dr. Siddhartha is a champion of community-based mental health care and caring for patients in their own environment. He is one of the few physicians in the province to still make house calls, which is an essential part of his frontline mental health support work. He is also a member of the Flexible Assertive Community Treatment (F.A.C.T.) team and the Mobile Crisis Unit team. Dr. Siddhartha continuously strives to improve access to mental health services and has been instrumental in reducing wait times to see a psychiatrist to well below the provincial and national average. Because of his commitment to frontline care, he was instrumental in creating a unique and highly successful program in which patients referred to the Horizon's Addition and Mental Health Services in the Miramichi area undergo a psychiatric screening to rule out serious mental illness. He is a firm believer in multidisciplinary teams and his passion for practicing and providing frontline care sets an example for his colleagues. In 2019, Dr. Siddhartha was awarded the Canadian Certified Physician Executive (CCPE) designation by the Canadian Society of Physician Leadership to recognize his exemplary performance as a leader. He is only one of three New Brunswick physicians to receive this distinction. Dr. Siddhartha has presented at the World Psychiatric Association Conferences in Beijing in 2010, Barcelona in 2015, and Mexico City in 2018. He has also presented at The Royal Australian and New Zealand Psychiatric Association conferences in 2014, 2016, 2018, and 2019. He also serves as Chair of the New Brunswick Psychiatric Association Board of Directors, of which he also served as the former president.

Dr. Eugene Mah

Medical Director, Miramichi area
A trained family medicine physician, Dr. Eugene Mah received his Bachelor of Science and his medical degree from the University of British Columbia. He went on to complete his family medicine residency at Dalhousie University, where he met his wife while on rotation in Fredericton. After finishing his residency, Dr. Mah and his wife worked and travelled in and outside of Canada before settling down in his wife's hometown of Miramichi in 2002 to raise their children. Since then, Dr. Mah has proudly worked in the emergency department of Horizon's Miramichi Regional Hospital, serving the Miramichi and surrounding area.

Dr. Margot Burnell

Chief of Staff, Saint John area
Dr. Margot Burnell has served as Chief of Staff for the Saint John area since September 2017 and brings over thirty years of experience as an oncologist in Saint John to her role. Before becoming Chief of Staff, Dr. Burnell was the Clinical Academic Department Head of Oncology at Horizon’s Saint John Regional Hospital (SJRH) for over a decade. Born and raised in Windsor, Ont., Dr. Burnell attended medical school at the University of Western Ontario and undertook her residency in Internal Medicine and Medical Oncology at the University of Toronto. She then spent a fellowship year at the Royal Marsden Hospital, London, U.K. Since that time, she has been working in Saint John, dedicating her professional career to the care of cancer patients, families, and their care providers. As an active member of the SJRH, she has sat on many hospitals, provincial and national committees, including the Local Medical Advisory Committee, the Medication Management Committee, and the Provincial Drugs and Therapeutics Committee and has been an active member of the Regional Medical Advisory Committee since 2013.

Dr. David Marr

Medical Director, Saint John area
Dr. David Marr has served as the Medical Director of the Saint John area for over a decade. A graduate of the University of New Brunswick, he completed his medical degree and residency training at Dalhousie University, specializing in internal medicine and cardiology, before joining the Horizon’s Saint John Regional Hospital in 1980. A Fellow of the Royal College of Physicians and Surgeons of Canada in Internal Medicine and Cardiology and the American College of Cardiology, Dr. Marr was instrumental in establishing the New Brunswick Heart Centre in 1991. Dr. Marr has held many leadership roles, including Chief of Internal Medicine, President of the Saint John Medical Society and the New Brunswick Medical Society, and has served on the Board of Directors of the Canadian Medical Association. In addition to his work as a staff cardiologist, he is also an Associate Professor of Medicine at both Dalhousie University and Memorial University.

Dr. Michael Perley

Chief of Staff, Upper River Valley area
Dr. Michael Perley has been Chief of Staff for Upper River Valley and the surrounding area since March 2020. Dr. Perley received his medical degree from Dalhousie University in 1980 and is a distinguished Fellow of the College of Family Physicians of Canada. He is a Family Medicine physician for the Woodstock and Tobique communities and participates in the obstetrical program at Horizon’s Upper River Valley Hospital. A current member of the Pharmacy Drugs and Therapeutics Committee for Health Canada, Dr. Perley is also a medical advisor for the Woodstock and Tobique First Nations, and a former president of the College of Physicians and Surgeons of New Brunswick. A dedicated educator, Dr. Perley has been involved in teaching medical students and residents for Dalhousie and Memorial Universities since 1985, and is an examiner for the College of Family Physicians. He received the Order of New Brunswick in 2017, as well as Dalhousie University’s 2012 Family Physician of the Year Award.

Medical Director, Upper River Valley area

This position is currently vacant.
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