Northern Light Mercy Primary Care welcomes six new providers

Date: 05/22/2026

Northern Light Mercy Primary Care is pleased to welcome new providers at four of its locations:
 
David Poor, MD, joined Northern Light Mercy Primary Care in Windham. Dr. Poor has been practicing medicine for more than 20 years. He earned his medical degree from Loma Linda University School of Medicine and completed his residency at St. Mark’s Family Medicine. He is board-certified by the American Board of Family Medicine.
 
Patrick Butsch, MD, joined Northern Light Mercy Primary Care in South Portland. Dr. Butsch earned his medical degree from the University of Vermont College of Medicine, completed his internal medicine residency at Brown University, and is certified by the American Board of Internal Medicine.
 
Maria Theresa "Marites" Petropoulos, MSN, FNP, joined Northern Light Mercy Primary Care in Falmouth. She has been practicing for over a decade and holds a Master of Science in Nursing from Husson University and a Bachelor of Science in Nursing from Fairfield University.
 
Matthew Mullen, NP, also joined the South Portland primary care office. Matthew is a board-certified nurse practitioner who received his medical education at Spring Arbor University in Michigan.
 
Anne Smith, NP, joined Northern Light Mercy Primary Care in Yarmouth. Anne is a board-certified family nurse practitioner with over six years of experience in family medicine. She received her medical and undergraduate degrees at the University of Southern Maine.
 
Hanna Campbell, PA, also joined the Falmouth office. Hanna was a primary care provider in Waterville for six years. She received her medical and undergraduate degrees at the University of New England.

Photo: Left to right, top row: Poor, Butsch, Petropoulus; bottom row: Mullen, Smith, Campbell.