Changes to Horizon’s Senior Medical Leadership

(HORIZON) – Horizon Health Network (Horizon) is pleased to announce three new local chiefs of staff and one medical director to its senior medical leadership team, effective immediately.

“We’re extremely proud to welcome these four respected physicians to our senior medical leadership team,” said Dr. Édouard Hendriks, Horizon’s VP for Medical, Academic and Research Affairs. “Each brings with them a wealth of experience in their fields, and their understanding of our challenges with physician recruitment will be a great asset to Horizon.”

Horizon would like to thank the outgoing medical leaders for their years of dedication and commitment to the physicians and patients in their respective roles.

“The pressures faced by the health care system over the last year were numerous, and we were fortunate to have these leaders at the table in our fight against COVID-19 and other issues,” said Dr. Hendriks.

The changes are as follows:


Dr. Martha Mills, a practicing obstetrician, is the new Local Chief of Staff for the Fredericton area. Read Dr. Mills’ full bio here

Dr. Mills replaces Dr. Patricia Bryden, who has stepped down from this role. Dr. Bryden will continue to practice as a general surgeon.

Dr. 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 over her career. From 2005 to 2014, she has served as the Department of Obstetrics and Gynecology’s clinical department head for the Fredericton area.


Dr. Bill Martin, a seasoned family practice leader, will take on the role of Local Chief of Staff for the Miramichi area. Read more about Dr. Martin here

Dr. Martin replaces Dr. Stewart MacMillan, who has stepped down from this role.

Dr. Martin graduated from Dalhousie Medicine in 1980, and after completing his internship, arrived in the Miramichi to start a family practice. He has maintained an active role in rural medicine, including obstetrics, emergency medicine, and psychiatry.

In 2012, he turned his family practice over to his son, Dr. Chris Martin, but has continued to work part-time in emergency medicine at the Miramichi Regional Hospital.

He has taken on various medical administrative roles over his career. Since 2016, he has been a Horizon Health Network Regional Medical Advisory Committee member, serving as the rural community appointee.

Dr. Eugene Mah, a recent head of the Emergency Department at Horizon’s Miramichi Regional Hospital, will be the new local medical director for the Miramichi area. Read Dr. Mah’s full bio here

Dr. Mah replaces Dr. Camille Haddad, who has stepped down from this position.

Dr. Mah graduated from UBC medical School in 1994, and completed a family practice residency with Dalhousie University in 1996. During that time, he met his wife, Kimberly, who is from the Miramichi area. They returned permanently to the Miramichi in 2002 to start a family, and Dr. Mah began working full time as an Emergency Medicine Physician. 

For the past few years, he has been the Emergency Department Clinical Department Head.


Dr. Warren Giberson, a recent medical director of the Surgical Program at Horizon’s The Moncton Hospital and an Ear, Nose and Throat (ENT) specialist, is the new Local Chief of Staff for the Moncton area. Read more about Dr. Giberson here.

Dr. Giberson replaces Dr. Ken Gillespie, an obstetrician/gynecologist (OB/GYN) who has stepped down from this position.

Dr. Giberson is a Fellow of the Royal College of Physicians and Surgeons of Canada (Otolaryngology-Head and Neck Surgery) and 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 within Horizon, teaches medical students and residents, and is a clinical instructor for Dalhousie University and a clinical assistant professor for the Université de Sherbrooke.

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For more information contact:

Kris McDavid
Media Relations