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Program Faculty

Daniel M. 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
Faculty of the Family Medicine Residency 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.

Stanley E. Yellin, M.D., M.B.A.
Faculty Preceptor

Dr. Yellin served as the Director of the Family Medicine Residency Program from 1999 – 2005. He became Director during his second tenure at Sacred Heart but stepped down to devote more time to lecturing and teaching. He has prior teaching experience as a faculty member in the Moses H. Cone Family Practice Residency Program in Greensboro, North Carolina, where he completed his own residency. Dr. Yellin has spent many years in private practice in New Jersey.

He received his B.A. from the University of Pennsylvania and his medical degree from Boston University School of Medicine. He completed a faculty development fellowship at the University of North Carolina at Chapel Hill and earned an M.B.A. from Lehigh University in 1999. Sacred Heart family medicine residents acknowledged him twice as “Teacher of the Year.” He coordinates pre-doctoral education.

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.

Elena Khromenko, M.D.
Faculty of the Family Medicine Residency Program

Dr. Khromenko received her medical degree from the UCIMED in Costa Rica.  She completed the Family Medicine Residency Program at Sacred Heart Hospital after serving as Chief Resident in 2012.  Dr.  Khromenko is committed to compassionate patient care and her clinical interests include women’s health and hospital medicine. 

Nandhini Veeraraghavan, M.D.
Faculty 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.

Sireesha M. Vemuri-Reddy, M.D.

Dr.Vemuri received her medical degree from College of Medical Sciences, Bharatpur, Nepal. She has completed Family Medicine residency in 2009 from Sacred Heart Hospital. After graduation, she has practiced traditional family medicine with a wide spectrum of experience in in-patient, out-patient and nursing home settings for more than 5 years. She has served as the medical director for Roane County Family Health Care for 2 years with administrative skills. Under her leadership, the center has acquired PCMH recognition with multiple Quality Initiative Awards. She has joined as a faculty at Sacred Heart Hospital Family Medicine Residency Program in 01/2015. She is a primary care physician with interests in chronic care model, In-patient and out-patient care and PCMH.

Darren Aboyoun, PhD
Behavioral Science Coordinator

Dr. Aboyoun earned his doctoral degree and Master of Arts in clinical psychology from Georgia State University, Atlanta, GA.  After completing an internship at the University of Medicine and Dentistry of New Jersey, he completed post-doctoral training at a crisis residential facility in Allentown, PA.  Licensed in the states of New Jersey and Pennsylvania, Dr. Aboyoun practices in Easton, PA.  He had the good fortune of receiving training in Dialectical-Behavioral Therapy that he incorporates in his work with individuals with a variety of emotional difficulties.  Additionally, he has seven years of teaching at the undergraduate level and two years of teaching medical residents in family practice.

Edward Curran, M.S.W.
Social Services

Mr. Curran is a licensed clinical social worker. He teaches residents and assists the residency’s patients. He received his B.S. from LaSalle College in Philadelphia and his M.S.W. from West Virginia University, and he is a member of the Academy of Certified Social Workers. He speaks Spanish and served in the Peace Corps in Central America for over two years. Mr. Curran also serves as an adjunct sociology professor at DeSales University in Center Valley, Pa.

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 in 1994. Kelli brings a wide range of experiences and her responsibilities include recruiting, licensing, scheduling, and keeping twenty-plus physicians organized.

Cindy Fritz
Family Medicine Residency Program - Program Coordinator

Ms. Fritz received her Medical Business Clinical Specialist certificate from the National Education Center at the Allentown Business School.  She joined the Family and Geriatric Medicine Residency as the Program Coordinator in 2007.  She coordinates the residency program in conjunction with Allentown Family practice which includes multiple scheduling duties for faculty, residents and fellows.  In addition, she is in charge of all nursing home and assisted living admissions, referrals and handles other issues as they arise.  Her experience includes child care counselor, clinical technician, paramedical and medical assistant.
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