Dr. Bannister teaching resident

Dr. Bannister Teaching a Recent Graduate

Competency Day supports a relaxed environment for residents to learn new skills.

Systems Residents and Faculty

[Systems] Outing

PGY1 residents meet with Dr. Linda J Haller and Dr. Angela Yerdon-McLeod for a mindfulness session during their [Systems] schedule.

Brehio teaching residents

Competency Day

Dr. Brehio supporting a first and second-year resident during competency day learning.

Dr. Brehio teaching resident

Dr. Brehio Teaching a Second-Year Resident

Dr. Meredith Milligan perfecting her skills at suturing a wound.

Dr. Geffken teaching residents

Dr. Geffken Teaching Three Residents

Dr. Meredith Milligan, Dr. Linda E. Haller and Dr. Sandra Mikail learning from our Program Director.

Meet Our Faculty

If you're seeking a residency experience that offers excellent educational and training opportunities, you can count on the multidisciplinary faculty at NH Dartmouth Family Medicine Residency Program (NHDFMR) to meet your expectations. Our faculty team includes family physicians (three of whom provide obstetrical care), pediatricians, obstetricians/gynecologists and several behavioral health specialists. They work collaboratively with each other as well as individually with you to provide an enriching and supportive learning environment.

Family Physicians

Dominic Geffken, MD, FAAFP
Program Director

Dr. Geffken (he/him) joined the NHDFMR faculty in July 2004 as the director of Leadership Preventive Medicine. He graduated from the University of Vermont College of Medicine. He completed both his family medicine residency and preventive medicine residency at the University of Massachusetts - Worcester. He also received his Master's of Public Health degree from the University of Massachusetts - Amherst. His interests include preventive medicine, quality improvement, behavioral health, geriatrics, addiction medicine and providing health care to homeless populations. In his spare time Dom likes to run in local road races, walk around Concord and sample the latest hometown microbrewery offerings.

Teri Brehio, MD
Medical Director

Dr. Brehio (she/her) joined the NHDFMR faculty in 2004. She received her medical degree from the University of Massachusetts Medical School in 2001 and completed her residency here at NHDFMR, where she served as chief resident from 2003-2004. She served as Education Director from 2011-2019. In 2020, Dr. Brehio became the Medical Director for the Family Health Centers - Hillsboro and Concord, along with the RICH program. She practices in the Hillsboro clinic site, in the town where she grew up. She coordinates the ICU curriculum and collaborates on the Clinic curriculum. Her clinical interests include obstetrics, dermatology procedures, preventive health, and teaching. When not at work, she does tap dancing, hip hop, plays indoor and outdoor soccer and attends her children's sporting events! She is also an avid animal lover with two dogs and six cats.

Gregory Thesing, MD
Interim Co-Associate Program Director

Dr. Thesing (he/him) joined the NHDFMR faculty in 1997 after spending two years as a staff physician at the United States Air Force Academy. Additionally, he was a clinical instructor in the Department of Family Medicine at the University of Colorado Health Services Center. Prior to his work in Colorado, he spent three years as a staff family physician at Eielson Air Force Base in Alaska. Currently, he practices at the Family Health Center - Hillsboro. He was past chair of the Concord Hospital Credentials Committee as well as the Medical Staff President. He is a member of several Hospital committees. His teaching interests include outpatient procedures, chronic care management, and working in multidisciplinary primary care teams.

Andy Valeras, DO, MPH, FAAFP
Associate Program Director of LPMR

Dr. Valeras (he/him) joined our faculty in 2012 following completion of the NHDFMR and Dartmouth Hitchcock Leadership Preventive Medicine Residency (LPMR). Dr. Valeras is an Associate Program Director for LPMR. He is a designated American Academy of Family Physicians fellow. Dr. Valeras currently seeks to integrate quality improvement and systems-based thinking with the clinical practice and education of family medicine providers in integrated teams. Dr. Valeras does this through the [Systems] course, taught via 480 hours of longitudinal experiential learning, over three years for primary care teams. Dr. Valeras has served as President of the Board of Directors for the Collaborative Family Healthcare Association 2019-2020 and currently is the Chair of Concord Hospital Medical Group Governance Council.

J. Bryan Bannister, MD

Dr. Bannister (he/him) received his medical degree from the University of Texas Medical Branch, Galveston in 1998. He completed his family medicine residency at the University of Rochester. Dr. Bannister joined the NHDFMR faculty in 2007 bringing with him six years of community health center experience.

Craig Betchart, MD

Dr. Betchart joined our faculty in the spring of 2021 following close to five years of working in private practice. Dr. Betchart serves as the director of the Musculoskeletal and Sports Medicine curriculum. He is a board-certified Primary Care Sports Medicine physician. Dr. Betchart currently splits his clinical time between his primary care clinic and his sports medicine consultation clinic.  He is a strong proponent of point of care ultrasound and is in the process of developing a formal curriculum for the residents. In his free time, Dr. Betchart enjoys being outside with his dogs, working on home improvement projects, waterskiing and downhill skiing.

Cynthia King, MD

Dr. King (she/her) joined our faculty in 2006. She received her medical degree from the University of Massachusetts in 2002 and trained at the University of Rochester Family Medicine Residency Program. Her interests include patient and resident education, adult inpatient care, and international and migrant health. Her other interests include hiking, kayaking, and exploring with her family.

Ellen J. Plumb, MD

Dr. Plumb (she/her) joined the NHDHFMR as a full-time faculty member in January 2021. She graduated from Sidney Kimmel Medical College in 2010. She completed her residency in family medicine Department of Family and Community Medicine in Philadelphia. Following residency, she remained at Jefferson as an Assistant Professor for her fellowship training in research and faculty development. Prior to moving to New Hampshire in 2018 (for a life adventure), she served as the Director of Undergraduate Medical Education in the Christiana Care Family Medicine Residency Program and as the Assistant Director of the Population Health Track and the Director of Global Health Programs at Sidney Kimmel Medical College. She also served as an adjunct professor of global health and human rights in the Master of Public Health program at Jefferson’s School of Population Health. Her past research utilized community-based participatory methods and primarily focused on refugee and immigrant mental health as well as global health education. She has worked extensively in Rwanda and Uganda in the areas of palliative care, primary care workforce capacity building, bi-directional medical education, and inter-professional public health programming. Her current clinical and academic interests are focused on refugee health, human rights, integrated mental health, narrative medicine, and arts-based community engagement projects. She has two young daughters and can be found most weekends wandering around local forests with her kids and camera.

Tamara Shilling, DO

Dr. Shilling (she/her) went to medical school at the University of New England College of Osteopathic Medicine. She did her residency in family medicine at Albany Medical College. Her areas of interest include behavioral health and preventive care.

Angela Yerdon McLeod, DO

Dr. Yerdon McLeod (she/her) received her medical degree from the New York College of Osteopathic Medicine in 2001. Following her residency at NHDFMR, she completed a fellowship in Women's Health at East Carolina University in Greenville, NC. She then returned to NHDFMR to join the faculty in 2005 as the Maternal Child Health education leader. She is active board member of the NH Academy of Family Physicians and an advocate for opportunities in leadership advancement particularly for residents and women in medicine at the national level. Her clinical and research interests include family-centered maternity and neonatal care, breastfeeding medicine, neonatal abstinence syndrome, contraception management and postpartum mood disorders. Angela recently initiated and leads the Concord Hospital Health and Wellness Taskforce. When she is not catching babies or teaching about them, she can be found nurturing the wellbeing of her own two teens, her husband or herself. She enjoys running, kayaking, mountain biking or hiking in the New Hampshire or Maine mountains.


Linda J. Haller, MD

Dr. Haller (she/her) joined NHDFMR in November of 2016 as a faculty in obstetrics and gynecology. She has worked and lived in New Hampshire for almost 30 years as an OB/GYN, with brief interludes of working in Nepal and New Zealand. She received her medical degree from the University of California, Irvine in 1986 and has previously worked in northern New Hampshire. Her interests in medicine are obstetrics, menopause, and mindfulness meditation. She was recently certified to teach mindfulness meditation. Her outside interests include cats, being in nature, traveling and meditation.


Viking Hedberg, MD 

Dr. Hedberg (he/him) joined the NHDFMR faculty in 2020. He graduated from Columbia University College of Physicians and Surgeons and completed his pediatric residency at the Children's Hospital of Philadelphia. He worked in Camden, New Jersey for three years at a community health center and a school-based clinic before completing an Adolescent Medicine fellowship and his public health training at the University of Rochester. Dr. Hedberg practiced full-spectrum general pediatrics in Plymouth, New Hampshire for 20 years including being the school physician for area public schools, at The Holderness School and at Plymouth State University. Prior to joining NHDFMR, he served as a pediatric hospitalist at Concord Hospital and continues to work in both the outpatient and inpatient settings. At NHDFMR, Dr. Hedberg oversees both inpatient and outpatient pediatric education for the residents. Areas of specific interest are optimizing the effectiveness and efficiency of primary care for children and adolescents, collaborative care in addressing learning, mood and attentional issues and management of chronic symptoms. He and his wife, Katie, who is a family nurse-practitioner, live in Plymouth with their dog, Buddy. They have two adult sons who both live in the Greater Boston area. Together they enjoy time with family and the lakes and mountains of New Hampshire.


Ana Castellanos Mendez, MD

Dr. Castellanos Mendez was born and raised in Guatemala City, and completed medical school in Guatemala, at Universidad de San Carlos de Guatemala. She completed residency in Family Medicine in Bethlehem, PA at St. Luke's University Hospital, followed by a geriatric fellowship at the same hospital, after which she joined St. Luke's Senior Care Associates in Bethlehem practicing full time Geriatrics in different settings, working in collaboration with other specialties, including in-hospital geriatric consultations, outpatient geriatric primary care, nursing home care and sub-acute rehab services. She served as the Medical Director at a large CCRC in Nazareth, PA, providing care for nursing home residents, as well as primary care for personal care home and independent living residents as well. She is very passionate about providing the best care to her patients and establishing relationships with them and their loved ones, providing education and advocating for them. She is devoted to improving health, independence, and quality of life of older adults, while focusing on their emotional, physical and functional needs. She love dogs and has two Airedale Terriers, including a puppy that is in training to become a therapy dog. Hobbies include cooking, traveling and relaxing with her husband and dogs and exploring beautiful New England.

Behavioral Health

Alexander Brown, PhD
Co-Associate Program Director

Dr. Brown (he/him) is a licensed psychologist, Interim Associate Program Director and core faculty member. He coordinates both the Behavioral Sciences and Population Health curricula, as well as the program’s didactic education. He teaches residents the diagnosis, management, and physiological underpinnings of mental and behavioral health concerns; patient-centered counseling skills (including motivational interviewing and shared decision making); health policy advocacy; biomedical ethics with a focus on health equity; and reflective practice. He received his doctorate in Counseling Psychology from West Virginia University; completed his clinical internship in Integrated Primary Care at the Battle Creek VAMC in Battle Creek, MI; and postdoctoral fellowship in Primary Care Behavioral Health jointly at the Edith Nourse Rogers Memorial VAMC in Bedford, MA, and University of Massachusetts Department of Family Medicine and Community Health. When not working, he can be found cultivating his Alterna-Dad persona at the local record store, independent cinema, microbreweries, and at home where he bakes lots of bread (some of which he leaves in the resident office).

Joni Staigers Haley, MS, LMFT

Ms. Haley (she/her), a licensed marriage and family therapist and American Association for Marriage and Family Therapy Approved Supervisor, joined NHDFMR in May 2000. She has an AB from Smith College and an MS in family studies with a concentration in Marriage and Family Therapy from the University of New Hampshire. She uses Emotionally Focused Therapy in her work with individuals and couples. Ms. Haley directs outpatient behavioral health services, which includes both specialty mental health counseling and integrated behavioral health services. She also directs the interdisciplinary behavioral health internship program at the Concord Hospital Family Health Center. Ms. Haley is one of the clinical supervisors for masters-level and doctoral-level behavioral health interns. She is a member of the Family Health Center leadership team and facilitated Concord Hospital Schwartz Center Rounds. Ms. Haley is a founding member of the Refugee Mental Wellness Community Council which works to advance health equity and access for Concord area New Americans. When not having her heart broken by the Red Sox or pining for her children and grandchildren who live across the country, Joni can be found on local hiking trails, paddling her kayak with her husband or attending classical music concerts.

Tina Kenyon, MSW, ACSW

Ms. Kenyon (she/her) completed her Master of Social Work degree at the University of Connecticut, and joined the NHDFMR faculty in 1995. Her responsibilities include resident and medical student education, curriculum development, advising and coaching. She facilitates a group for residents to explore clinical uncertainty. She coordinates the Residency Program Evaluation Committee. Ms. Kenyon has contributed to the skill development of faculty, primary care residents and other health care professionals in a variety of content areas for 34 years. Her background also includes health care social work, family therapy practice, organizational development, process improvement, facilitation and mediation. She has numerous publications and has presented on a variety of topics at regional, national and international conferences. 

Alexandra (Sasha) Kuftinec, MD

Dr. Kuftinec (she/her) completed a triple board residency in Pediatrics, Adults Psychiatry, and Child and Adolescent Psychiatry at Tufts/ Boston Floating Hospital/ New England Medical Center after graduating from the University of Louisville School of Medicine in 1988. After working for more than 10 years in community mental health centers, she joined the NHDFMR faculty in 2007 where she teaches family medicine residents and provides psychiatric consultation for patients across the lifespan who have behavioral and mental health issues. She has an interest in, and a commitment to, the assessment and treatment of mental health issues as part of a team in an integrated primary care/behavioral health setting where patients often have significant medical and psychosocial complexity. Beyond work, her passions include hiking, music (especially choral singing), theatre and spending time with family and friends.

Aimee Burke Valeras, PhD, LICSW

Dr. Valeras (she/her) is Scholarly Activity faculty at the NHDFMR and Leadership Preventive Medicine Residency (LPMR) and works in the Behavioral Health Department at the Family Health Center. She received her undergraduate and Masters of Social Work degrees from Boston College and her Doctorate in Social Work from Arizona State University. She has presented nationally and internationally on the topics of integrating behavioral health and primary care, on disability and illness identity and on qualitative research methodology. Her interests include working with survivors of domestic violence, addressing ‘isms’ in the medical environment, and narrative medicine. With NHDFMR, Dr. Valeras serves as a resource to residents, faculty, and staff in the areas of quality improvement and quantitative measurement, as well as proposing, presenting, or publishing their work. With LPMR, she assists in resident coaching, practicum implementation and program development. In her clinical role, she fulfills precepting and patient care responsibilities. In her free time, she enjoys being with her three children, hiking, writing, drinking coffee and listening to live music.

Academic Advisors 

  • Andrew Valeras, DO, MPH, FAAFP
  • Cynthia King, MD 
  • Alex Brown, PhD
  • Tara Davis- Thompson, LCMHC, MLADC
  • Bryan Bannister, MD 
  • Tina Kenyon, MSW, ACSW
  • Viking Hedberg, MD
  • Ellen Plumb, MD
  • Linda J. Haller, MD 
  • Alexandra Kuftinec, MD
  • Angela Yerdon McLeod, DO
  • Teri Brehio, MD
  • Gregory Thesing, MD 
  • Aimee Burke Valeras, PhD, LICSW
  • Craig Betchart, MD

Administrative Team

  • Director of the Family Health Center and the NH Dartmouth Family Medicine Residency, Sarah Kelly
  • NHDFMR Residency Manager, Kris Briand, MS
  • NHDFMR Recruitment and Leadership Preventive Medicine Residency Coordinator
  • NHDFMR Scheduling Coordinator, Holly Twitchell
  • NDHFMR Education/Database Coordinator, Maria Petagna