Meet Our Staff
Family Doctors in Gales Ferry, CT
At Gales Ferry Medical Group, our highly qualified family doctors, nurse practitioner and professional support staff provide exceptional care for you and your family. From the time you make your appointment until you walk out the door, you will receive attentive service and individualized care from all of our healthcare professionals and staff.
To schedule an appointment, call our office at (860) 464-7274 as we are currently rebuilding our patient portal.
Sanford A. Greenhouse, MD
John J. Hennessey, MD
Catherine Krenicky, APRN
Kathleen O'Connor, DNP, APRN
Patricia Murdoch DNP-APRN
Sanford A. Greenhouse, MD
Dr. Greenhouse has been practicing medicine since 1976. He earned his medical degree from the Medical College of Virginia in Richmond and completed both his internship and residency at George Washington University Medical Center in Washington, D.C. Shortly after completing medical school and his residency, Dr. Greenhouse practiced in La Jolla for two years and then joined Gales Ferry Medical Group in 1978.
Dr. Greenhouse was employee Medical Director at Pfizer in Groton, Connecticut from 1979 to 1989. From 1994 to 2003, Dr. Greenhouse also served as the Medical Co-Director at the Convalescent Center in Niantic, Connecticut. From 2003 to 2006, he was the Medical Co-Director of Beechwood Rehabilitation and Nursing Center in New London, Connecticut. In addition, he has been Vice-President of Colonial Cooperative Care since 2000.
Dr. Greenhouse is the Vice President of the New London County Medical Society and a member of the Connecticut State Medical Society.
John J. Hennessey, MD
Dr. Hennessey completed his undergraduate education in 1991 at Syracuse University in New York, where he graduated with honors. In 1999, he earned his medical degree from Tufts University School of Medicine in Boston, Massachusetts. He then moved to Denver, Colorado where he performed his internship and residency in internal medicine at the University of Colorado Health Sciences Center.
After completing his residency, Dr. Hennessey moved back to the east coast and joined Gales Ferry Medical Group in 1999. He is board certified by the American Board of Internal Medicine.
Dr. Hennessey is the Medical Director at Avalon Healthcare Center, in Stonington.He has also been the medical director of Groton Regency Center since 2005.
Dr. Hennessey is a member of the New London County Medical Society, Connecticut State Medical Society and of the American College of Physicians. From 2004 to 2006, he was a member of the Medical Executive Committee at Lawrence & Memorial Hospital, and he was a member of the Pharmacy Committee from 2008 to present.
Catherine Krenicky, APRN
Ms. Krenicky has been an Adult Nurse Practitioner since 1991. She received both her Bachelor and Master degree in nursing from Boston College, in Chestnut Hill, MA. She is certified in Adult Health by the ANCC.
From 1991-1997, Ms Krenicky was practicing with a medical group in Jamaica Plain, MA. She then moved to Connecticut and spent 6 years with a practice in Groton, CT. In 2003, she took time from regular practice to be with her children. During this time she worked for Apple Health Care in long term care. Ms. Krenicky joined Gales Ferry Medical in 2009.
Kat O'Connor is a nurse practitioner certified in adult primary care. She has been practicing since 2002- eighteen of those years in an internal medicine practice in Hebron. Kat holds both a clinical Doctor of Nursing Practice (DNP) degree from UCONN and a Master of Science in Nursing degree (MSN) from Yale.
In May of 2023, shortly after her physician colleague retired and closed her internal practice, Kat joined the Gales Ferry Medical Group. She is now in her 21st year of practice and remains dedicated to providing patient-centered, holistic care delivered in a compassionate, supportive, inclusive and empowering environment.
Bio Coming Soon!
