Dr. Koganski has been a practicing physician in Bucks County since 1997 and is Board Certified by the American Board of Internal Medicine. He is a member of the American Medical Association, the American College of Physicians and the American Academy of Medical Acupuncture. Dr. Koganski was named as the Smartest Family Physician in America in 2013 & 2014 and the # 1 Smartest Doc™ Internist in 2014 & 2015 by MDLinx.com in collaboration with the Cleveland Clinic, winning these honors among thousands of participating physicians countrywide. Dr. Koganski is on staff at the St. Mary Medical Center with full admitting privileges. He is also the Medical Director of Forrest Health of Bucks County, a bariatric specialty hospital in Langhorne. His practice is dedicated to the comprehensive treatment of the whole patient through preventive care, in-depth medical approaches and referrals to specialists when needed. Dr. Koganski specializes in the diagnosis and treatment of complicated medical problems, utilizing the most up-to-date advances in medicine. He strives to continually improve his knowledge through extensive medical education. He also offers a Concierge Program, which includes consultations and treatments that incorporate multiple holistic modalities of both Western and Eastern medicine, including Medical Acupuncture, homeopathy, biopuncture, herbal medicine and Functional Medicine evaluations.


Dr. Bornstein-Chau specializes in hospital medicine. Trained in Internal Medicine at Temple University Hospital and Board Certified in Internal Medicine since 2009, and has practiced since that time at several hospitals in the Philadelphia area.
Dr. Bornstein-Chau focuses on the care of hosptialized patients. She recognizes that being hospitalized can be unsettling both for patients and families, but she views these potentially difficult experiences as opportunities for opening dialogue about making choices that can decrease the likelihood of hospitalization in the future. Her specific areas of physiologic interest are in interactions of diseases of the lungs and heart, and heart failure in particular. But her real passion is for the art of medicine, for the place where science and humanism overlap. Dr. Bornstein-Chau knows that clear communication with patients, their families, and their primary care physicians is of the utmost importance in helping people reach their goals of better health. She feels that the education piece is one of her most important contributions she can make to a patient's return to health. She loves to help patients and their families understand the reasons why they may not feel as good as they used to, and to help them discover ways to make incremental changes in their lives to help them reach their goal of feeling better, and actually being healthier. In our world where everything moves so quickly and "answers" seem to be at your fingertips, I think many people feel like they should be able to make overnight changes in their health and that if they don't, they are failures. I think it's incredibly important to remove this expectation, and to help people understand that slower changes are not only easier, they are usually better for you and are more sustainable.


Dr. Estrin has been practicing medicine in affiliation with St. Mary's Medical Center since 2006 when he was board certified by the American Board of Internal Medicine. After high school in Delaware County (PA), he graduated from Princeton University majoring in molecular biology and the Woodrow Wilson School of public affairs. His medical education was at Drexel College of Medicine followed by post-graduate training at Pennsylvania and Greenwich (CT) Hospitals. Dr. Estrin held a clinical faculty position at the Perelman School of Medicine (Penn) from 2008 to 2014 when he ran its Bucks County practice's inpatient service at St. Mary's. He also is an associate medical director for Gentiva (Kindred) hospice and is a member of the National Hospice and Palliative Care Organization. He specializes in transitions of care from the inpatient setting to rehab and return home. He is most proud of his outpatient practice that is largely comprised of patients that he has successfully treated and managed following visits to St. Mary's Medical Center. He is recognized by his peers as a thought leader in his field resulting in his election as a fellow of the American College of Physicians in 2014. Dr. Estrin resides with his wife, Joanne, and their two daughters in Richboro, PA.


Christina Mangoni is an AANP board certified Family Nurse Practitioner. Christina practiced as a registered nurse at St. Mary Medical Center from 2007-2013. She graduated from Thomas Jefferson University in 2012 with a Masters of Science in Nursing, specializing in family medicine. For the past few years, Christina has practiced at local retail health clinics, providing healthcare to a wide variety of patients ranging from children to older adults. Christina joined Newtown Internal Medicine practice in November, 2015. She hopes to build successful, lasting relationships with her patients by incorporating a collaborative nursing/medical approach to their healthcare.