Daniel H. Coller, M.D.
Director of the Family Medicine Residency Program
Faculty of the Geriatric Fellowship Program
Dr. Coller joined the Sacred Heart Hospital faculty in 2004 after 30 years as a faculty member and director of geriatric education for the Harrisburg Family Medicine Residency Program. While at that location, he was honored as “Teacher of the Year” several times.
Dr. Coller has served as the Chairman of the Credentials and Bylaws Committees at the Pinnacle Health System in Harrisburg, as well as Chairman of the Family Medicine Department and a Board of Director of several hospitals.
After completing his undergraduate studies at Pennsylvania State University in State College, Dr. Coller received his medical degree from Temple University School of Medicine and later completed a family medicine residency program at Harrisburg Hospital. In 1999, Dr. Coller received his Certificate of Added Qualification in Geriatrics; he was recertified in 2008.
Dr. Coller also serves as the Medical Director of Sacred Heart Hospital’s Hospice Program. Throughout his career, he has been a Clinical Assistant Professor of Medicine at several medical schools, including Hershey and Drexel Medical Schools and most recently the Philadelphia School of Osteopathic Medicine. His clinical interests include the broad spectrum of geriatrics, end-of-life care, evidence-based medicine, and inpatient care.
Richard T. Martin, M.D.
Director of the Geriatric Fellowship Program
Dr. Martin joined the Sacred Heart Hospital faculty in 2000 after many years of private practice and teaching in Canada, North Dakota, and Minnesota. Just prior to becoming a faculty member at Sacred Heart Hospital, he taught at Michigan State University’s Family Medicine Residency Program in Kalamazoo, where he was also the Director of Geriatrics.
In 1978, Dr. Martin earned his medical degree from the University of Manitoba, Canada, and in 1980, he completed his residency at the University of Manitoba, serving as Chief Resident. He received a Certificate of Added Qualification in Geriatrics in 1992. Dr. Martin was the Director of Sacred Heart Hospital’s Geriatric Medicine Fellowship Program from its inception until he became the Director of Sacred Heart’s Family Medicine Residency Program.
He has received the family medicine residents’ “Teacher of the Year” award three times at Sacred Heart Hospital and three times at Michigan State University. His clinical interests include urinary incontinence, osteoporosis, and nursing home care.
Loretta Witczak Keil, M.D.
Faculty of the Family Medicine Residency Program
Dr. Keil rejoined the Family Medicine Residency Program faculty in 2000 after 12 years of outpatient service to Sacred Heart Hospital patients. Previously, she served as a faculty member from 1984 – 1987 as the Inpatient Medical Director. Dr. Keil also served as Sacred Heart Hospital’s Vice President of Medical Affairs.
Dr. Keil earned her medical degree from the Medical College of Pennsylvania (now Drexel University) and completed her residency in internal medicine at Lehigh Valley Hospital. She was awarded the 2004 “Teacher of the Year” award from the residents. Her clinical interests include cardiology and rheumatology.
Nandhini Veeraraghavan, M.D.
Assoc. Director of the Family Medicine Residency Program
Dr. Nandhini received her M.B.B.S. from Lady Hardinge Medical College, New Delhi, India. She completed her surgical internship at Guthrie/Robert Packer Hospital, Sayre, PA and her residency at St. Luke’s Hospital, Bethlehem, PA.
In addition, she completed a fellowship in Sports Medicine at St. Luke’s Hospital. Dr. Nandhini’s experience includes working as a physician at St. Luke’s Hospital, Bethlehem, PA, and Coordinated Health System, Allentown, PA. She is a primary care physician with a wide range of clinical interests including preventative medicine, sports medicine and managing chronic conditions.
Rehab Tabchi, D.O.
Family Medicine Residency Faculty & Office Medical Director
Dr. Tabchi received her Doctor of Osteopathic Medicine from Philadelphia College of Osteopathic Medicine and went on to complete the Sacred Heart Family Medicine Residency Program where she was the Chief Resident of the program. Her professional medical experiences include providing medical care for patients from pediatrics to geriatrics, working in an intensive care unit where she became a member of the Palliative Care Team, and supervising and guiding advanced practitioners on the standards of medical practice. Her previous experience includes working for Geisinger Health System before joining Sacred Heart. She is board certified by the American College of Osteopathic Board of Family Physicians and is an avid member of American Osteopathic Association, Pennsylvania Osteopathic Medical Association, American College of Osteopathic Family Physicians and the Pennsylvania Osteopathic Family Physician Society. Dr. Tabchi continues to provide the best quality health care for her patients while training and guiding the current family medicine residents.
Christine Maher, MSW, LSW
After completing her B.A. in Social Work with a minor in Gerontology from Cedar Crest College, Allentown, PA, Ms. Maher earned her Master of Social Work from Marywood University, Scranton, PA. Her professional experience includes geriatric social work, palliative care social work, hospice social work, cancer center social work, and outpatient mental health therapy. As a licensed social worker in the state of Pennsylvania, she is currently the outpatient medical social worker in Sacred Heart Hospital’s Case Management Department. She works with patients, and families to assess the biopsychosocial dynamics and needs of the patient on a consultation basis for the family practice clinic, OB clinic, pediatric clinic, and other outpatient practices on Sacred Heart’s campus as needed. In addition she provides mental health counseling, mental health risk assessments and coordinates appropriate follow up services. In her role as a faculty member of Sacred Heart Hospital’s Family Medical Residency program, she educates medical residents on the role of the social worker in an outpatient family practice.
Kelli Mills, M.A.
Family Medicine Residency Program Administrator
After a career in business and finance, Kelli attended Lehigh Carbon Community College for medical assistant training. She then joined Sacred Heart HealthCare System in 1994. Kelli brings a wide range of experiences to her role as the Administrator of Sacred Heart Hospital Family Residency Program and Allentown Family Practice.
Family Medicine Residency Program - Program Coordinator