Meet the FMMC Providers
Audrey A. Tracey, MD
Dr. Tracey graduated from Boston University School of Medicine in 1995 and completed her residency at the UMass Fitchburg Family Practice Residency Program in 1998 and has practiced in the area since then. Dr. Tracey founded Family Medical & Maternity Care, P.C. in 2001. She enjoys the full scope of family medicine including maternity care. She enjoys her family, cats, the ocean and gardening.
Holly Mazur, MD
Holly Mazur graduated from Tufts University School of Medicine in 1992, where she received honors including induction into Alpha Omega Alpha, the National Honor Medical Society, and the Janet M. Glasgow Memorial Achievement Citation, awarded to top female graduates at Tufts. Holly completed her internal medicine residency at UMass Memorial Medical Center in Worcester, where she also completed additional training in pulmonary and critical care. For more than two decades, Holly has worked as a primary care provider in Massachusetts. Previously, she was a hospitalist at Health Alliance in Leominster and has spent time consulting for several pharmaceutical companies. Dr. Mazur enjoys taking care of complex medical conditions. She has special clinical interest in cardiology, lung diseases, and geriatrics. In her free time, she enjoys hiking, biking, and spending time with family, friends, and her rescue dogs.
Justine Monthony-Eaton, DO
Justine Monthony-Eaton is an alumnus of Union College in Schenectady, NY, receiving their Bachelor of Science in Psychology and Biology in 2017. They then went on to receive their doctorate of osteopathic medicine from the University of New England College of Osteopathic Medicine in 2021. While completing training at UMass Fitchburg Family Medicine Residency, Justine created a two-year LGBTQIA+ family medicine residency curriculum, created pathways for their clinic to address the underserved medical needs of transgender and gender diverse patients, and co-founded a scholarship for future residents interested in providing gender affirming care. They also worked with clinical psychologists to improve their residency wellness curriculum and presented the curriculum at the 2023 Collaborative Family Healthcare Association Conference and completed the American College of Lifestyle Medicine Residency Curriculum. During their third year in family medicine residency, Justine attended the LGBTQIA+ Health Fellowship Leadership Seminar Series through Harvard Medical School and Fenway Health. In their spare time, Justine enjoys hiking, camping, and kayaking with their husband and dog. When home, they can often be found crocheting, gardening, or building Legos.
Nurse Practitioners and Physician Assistants
Nurse Practitioners (NP) and Physician Assistants (PA) are registered nurses with advanced academic and clinical experience, enabling him or her to diagnose and manage common and chronic illnesses, including prescribing medication. Working in collaboration with a supervising physician, nurse practitioners and physician assistants provide high-quality individualized care. They focus largely on health maintenance, disease prevention, counseling and patient education in a wide variety of settings. With a strong emphasis on primary care, nurse practitioners and physician assistants are employed within several specialties, including family medicine, adult health, pediatrics, neonatology, women's health, mental health, geriatrics and acute care.
Nurse Practitioners
Rebecca Johnston, FNP
Rebecca received her Bachelor's and Master's degrees in Nursing from Fitchburg State College in 1995 and 1999 respectively. In May 1999 she was awarded her Post-Master's Certificate as a Family Nurse Practitioner from Regis College. Rebecca has extensive clinical and nursing instruction experience and also serves as Practice Administrator for FMMC. Rebecca has been a part of the FMMC team since it was founded in 2001.
Megan Cali, FNP
Megan received her Bachelors in Nursing and Masters of Science Degrees from Regis College in 2015 and 2016 respectively. While working towards her degree, she worked as a medical-surgical nurse at Health Alliance Hospital. Megan is board certified as a Family Nurse Practitioner and has a special interest in fitness and nutrition! Megan officially joined the FMMC team in July 2016.
Abby Herget, FNP
Abby received her associate degree from Mount Wachusett Community College in June 2006 and her bachelor’s degree in nursing from the University of Phoenix in 2012. She then went on to earn her master’s degree in nursing from Massachusetts College Of Pharmacy and Health Sciences in May 2014. While working towards her master’s degree Abby practiced as a school health nurse and provided nursing services at a private school. Abby is certified through the American Academy of Nurse Practitioners. She also enjoys camping and spending time with her family and two dogs. FMMC welcomed Abby to the team in April 2018.
Carolyn Tracey, FNP
Carolyn Tracey graduated with a Bachelors of Science in Human Physiology from Boston University in 2016. After graduation she worked on a clinical research team at the Mass General Hospital Cancer Center for several years before completing her Bachelors of Science in Nursing in 2020, also at MGH. Carolyn then worked as an inpatient registered nurse at Beth Israel Deaconess Medical Center while simultaneously working towards her Masters of Science in Nursing at MGH, which she completed in Spring 2022. She is board certified in Family Medicine through The American Nurses Credentialing Center. Recently married, Carolyn enjoys spending time outside with her husband Bob and their two year old Bernedoodle, Walter. She will begin seeing patients in November 2022. Carolyn may be a familiar face to some FMMC patients as she has held various positions in the office including recently as a family nurse practitioner student.
Althea Keeling, FNP
Althea (Tia) Keeling has been practicing medicine as a Nurse Practitioner since 2012. She studied nursing at the MGH Institute of Health Professions in Boston, where she focused on Adult and Women’s Health. After graduating with both a Bachelor’s and Master’s of Nursing, she moved to rural northern New Mexico, where she was a nurse practitioner in a community health center providing primary care to adults, pregnant women, and the elderly. Tia soon decided to expand her practice to include pediatric patients so that she could care for entire families across the lifespan. After returning to school in 2016 while continuing her clinical practice, Tia was awarded her Post-Master’s Certificate as a Family Nurse Practitioner. She continued to practice as a FNP until 2020, when she and her partner decided to return to the east coast to raise their children closer to their families. Ms. Keeling grew up in Lunenburg, MA, and is excited to return to clinical practice in the community where she was raised. She is passionate about providing high-quality care that improves the lives and well-being of her patients.
Tia loves biking, gardening, and playing with her kids. She is enjoying being back in the Northeast after a decade in the Southwest and is looking forward to her future here.
Physician Assistants
Priscilla Amuma, PA
Amanda Diffin, PA
Amanda Diffin graduated from the University of New England with a Bachelors of Science in Medical Biology in 2017 and a Master of Physician Assistant Studies in 2019. She worked first in internal medicine but has spent the last four years working in pediatrics. She has a passion for treating children and adolescents but is excited to begin treating families as a whole. Amanda grew up in the area and enjoyed teaching gymnastics for many years before starting her career in medicine. She became a mom to her little boy in November 2023. In her free time, she enjoys spending time with her son and attending artisan markets with her husband.
