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Family Medicine Residency Program Leadership

Program Director

Michael Gillan,DO

Michael Gillan, DO is the Department Chair and Program Director in the Sayre Family Medicine Residency Program. He completed his undergraduate studies at the University of Scranton and earned his osteopathic degree from the Philadelphia College of Osteopathic Medicine. He is from Sayre, Pennsylvania, and completed his Family Medicine Residency Training at the Sayre Family Medicine Residency. Clinical interests include Geriatrics, Hospice, and Inpatient Medicine.

Associate Program Director

Michelle A. Nanda, MD, MPH, FAAFP

Michelle A. Nanda, MD, MPH, FAAFP is the Associate Program Director of the Guthrie Family Medicine Residency. She completed her undergraduate studies at Penn State University and earned her medical doctorate from Sidney Kimmel Medical College of Thomas Jefferson University. She completed her Family Medicine Residency training at the University of Connecticut. Her clinical interests include pediatrics, women’s health, LGBTQ+ care, and addiction medicine. She has spearheaded residency initiatives to enhance training in obesity and addiction medicine. She has been honored with the Guthrie/Robert Packer Attending of the Year Award in 2017, 2018, 2019 and 2021.

Medical Director

Corina Marshall, MD, FAAFP

Corina Marshall, MD, FAAFP is faculty in the Sayre Family Medicine Residency Program. She earned a medical degree from the Escuela Latinoamericana de Medicina in Havana, Cuba. She completed her Family Medicine Residency at Saints Mary and Elizabeth Medical Center in Chicago, Il. Her clinical and research interests include full spectrum family medicine including obstetrics, pediatrics, office based gynecological procedures, LGBTQ health and addiction medicine.

Program Coordinator

Sue Sinsabaugh

Sue Sinsabaugh

Faculty

Maximos Attia, MD, FAAFP

Maximos Attia, MD, FAAFP is a core faculty member in the Guthrie Family Medicine Residency program. He was educated at the University of Alexandria in Egypt, completed a Family Medicine residency at Montgomery Hospital and a surgery fellowship at the University of Alexandria. He also completed a Faculty Development Fellowship at UNC. He is the medical director of the Sayre Walk-In Clinic and the Anticoagulation Clinic. Clinical interest include primary care services, adult medicine, geriatrics, and surgical procedures. His recent publications include topics related to esophageal varices, risk factors for deep venous thrombosis, and biliary stenting.

Dexter Dale, DO CAQ-SM

Dexter Dale, DO CAQ-SM is a Family Medicine/Primary Care Sports Medicine physician in the Sayre Family Medicine Program. He completed his undergraduate studies at Truman State University in Kirksville, MO. He then completed a dual degree program at Kansas City University, earning his Doctorate of Osteopathy and Master of Bioethics. While in medical school, he also completed a one-year undergraduate teaching fellowship which focused on teaching clinical exam skills and Osteopathic Manipulative Treatment (OMT) to medical students. He is originally from the Kansas City, Missouri, area. He completed his Family Medicine Residency training at the Sayre Family Medicine Residency, and then completed a fellowship in Primary Care Sports Medicine at Rochester Regional Health in Rochester, NY. Clinical interests include Sports Medicine/Orthopedics, LGBTQ+ Health, and OMT.

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Anna Konstas, MD

Anna Konstas, MD is a core faculty member of the Guthrie Family Medicine Residency Program. She was educated at the Commonwealth Medical College/Geisinger Commonwealth School of Medicine in Scranton, PA. She completed her family medicine residency at Guthrie Robert Packer Hospital. She has special interests in women’s health and obstetrics and gynecology.

Donald Phykitt, DO

Donald Phykitt, DO is a core faculty member of the Guthrie Family Medicine residency. He served as the program director for several years. He also serves as the director of the Guthrie Concussion Clinic. He received his degree from the New York Institute of Technology, College of Osteopathic Medicine. He completed an internship at the Delaware Valley Medical Center in Langhorne, PA. He completed his family medicine residency at Warren Hospital, with a sports medicine fellowship at Penn State Sports Medicine in Hershey, PA. He has special interests in sports medicine, osteopathic medicine, and traumatic brain injury.

Alexander Porter, DO

Alexander Porter, DO

Alexander Porter, DO, CAQSM is a core faculty member in the Guthrie family medicine residency program. He was educated at Lake Erie College of Osteopathic Medicine at Seton Hill in Greensburg, PA. He completed his family medicine residency at the Latrobe Hospital in Latrobe, PA. Dr. Porter then went to complete a primary care sports medicine fellowship at WellSpan Health in York, PA. He has special interest in osteopathic manipulation treatment, ultrasound-guided injections, and helping athletes of all ages return from injury to activities they enjoy. He has previous research experience with mental health and the incidence of concussions in Division III collegiate athletes.

Danielle L. Terry, PhD, ABPP

Danielle L. Terry, PhD, ABPP is the Director of Behavioral Science at the Guthrie Family Medicine Residency. She graduated from Syracuse University, is board certified in clinical health psychology, completed a Behavioral Science/Family Systems Educator Fellowship in 2020, and currently serves as the lead psychologist for Guthrie Breast Cancer Clinic. She has clinical interests in cancer, smoking cessation, clinical hypnosis, evidence-based treatments, and women's health. She is a co-author and editor of the book, Providing Home Care for Older Adults: A Professional Guide for Mental Health Practitioners. Her recent publications focus on the intersection of gender, bullying, and well-being in rural medical providers and trainees.

Program Ombudsperson

Katherine Lincoln, DO, MHA, FACOFP, FAAFP

Katherine Lincoln, DO, MHA, FACOFP, FAAFP is a physician at the Center for Wound Care and Hyperbaric Medicine at the Guthrie Medical Group, Sayre, PA. The Center is recognized as a regional Center of Excellence. Dr. Lincoln attended medical school at the University of New England, Biddeford, Maine. She completed a residency in family medicine in Binghamton, NY. Her practice is now dedicated to wound care full time. She is board certified by the American Osteopathic Board of Family Medicine. She has international experience in speaking on wound-related topics. Dr. Lincoln holds many leadership positions. She is the past President of the Texas Society of the American College of Osteopathic Family Physicians, served on the Board of Texas Osteopathic Medical Association (TOMA), currently serves as Chair of Pennsylvania’s Caucus to the ACOFP Congress. In 2018, she was named Young Osteopathic Family Physician of the Year by ACOFP. She is a Trustee on the Board of Pennsylvania Osteopathic Family Physician Society. At Guthrie Medical Group, she is the ACGME Ombudsman for the Family Medicine Residency Program.

Community Preceptors

Christopher D Andres, MD

Mark Corey, MD

Mark Corey, MD is a community preceptor in the Guthrie Family Medicine Program. He served as core faculty for several years. He received his medical degree from the State University of New York at Upstate and competed his Family Medicine Residency at Guthrie Robert Packer Hospital.

Matthew Estill, MD

Matthew Estill, MD is a community faculty in the Sayre Family Medicine Residency Program. He completed his undergraduate studies at Princeton and earned a medical doctorate from Mount Sinai School of Medicine in 1992. He completed his Internal Medicine Residency training at Dartmouth Medical School in 1995, and a one year fellowship in Gastroenterology at University of Connecticut. He has published several articles in peer reviewed medical journals, the most recent in the Journal of the American Geriatrics Society in 2020. He co-authored a chapter in the book, Diseases of the Liver and Bile Ducts, and has presented at national and regional medical societies on telemedicine, medical group practice quality improvement, and various primary care internal medicine clinical topics. He practices full time primary care internal medicine. His clinical interests include: telemedicine, primary care preventive medicine, obesity and weight loss, diabetes and medical group practice quality improvement.

Gabriel Garcia-Ryan, DO

Brent S Ingerick, DO

Anne Pamula, MD

Verlyn Warrington, MD, MS, FOMA

Verlyn Warrington, MD, MS, FOMA is the Director of Bariatric Medicine at Guthrie. She graduated from University of Maryland School of Medicine. She is board certified in both family medicine and obesity medicine. She is fellowship trained in faculty development and women’s health and completed the Obesity Medicine Advances Curriculum Fellowship Program in 2016. She has clinical interests in food as medicine and health disparities relating to obesity. She is actively engaged in advocacy on state and national levels around the area of access to anti-obesity medications. Recent publications examine the impact of treating obesity in primary care.

Molly Witham, DO

Molly Witham, DO

Therapy Dog

Chula Patata Terry (aka Chula)

Chula Patata Terry (aka Chula)

Chula Patata Terry (aka Chula) joined the faculty in 2022 after completing her certification as a therapy dog. Her clinical specialties include playing "prickle ball," imitating a potato, and snorting loudly. She enjoys prolonged eye contact and is available to residents during didactics with Dr. Terry.