As a resident of Mather Hospital, you will have the distinction of working with, and being mentored by, a remarkable group of board-certified physicians. Our faculty includes nationally recognized clinicians and researchers, with vast levels of experience teaching and guiding students in their journey to becoming licensed physicians. All of our faculty members are board certified, some in multiple specialties, bringing a well-rounded knowledge to each rotation they supervise. The physicians listed below are considered the core faculty of the residency program. All of these physicians hold academic appointments at Stony Brook Medicine.

Joseph Ng, MDJoseph Ng, MD is the Program Director of the Transitional Year Residency Program.  He also serves as a core faculty member in the Department of Medicine, a Critical Care Intensivist, Asst. Vice President of Medical Affairs, and the Chief Medical Information Officer of Mather Hospital.  After receiving his medical degree from Ponce School of Medicine, Dr. Ng went on to complete his residency at St. Vincent Catholic Medical Center of New York as well as Richmond University Medical Center where he served as Co-Chief Resident and then Chief Resident. He subsequently completed a fellowship in Critical Care Medicine with the Department of Surgery at Mount Sinai Medical Center, where he served as the Chief Administrative Fellow before joining Mather Hospital. He is board certified in both Internal Medicine and Critical Care, fluent in Spanish (he was raised in Puerto Rico), Cantonese, and has a working knowledge of Mandarin and French. In his spare time, he loves to travel and cook and is particularly well informed about restaurants and wines. Dr. Ng is also on the Board of Directors of a NGO that provides free cataract surgeries and medical care for the under-served populations of the world.

Maritza Groth, MD

Maritza Groth, MD is a clinical faculty member in the Department of Medicine and serves as a core faculty member of the Residency Program.  A graduate f New York University School of Medicine in 1983, Dr. Groth completed her residency and subsequent fellowships at Stony Brook Medicine, and is board certified in Internal Medicine, Critical Care Medicine, Pulmonary Medicine, Sleep Medicine, Neuro-Critical Care, and Critical Care Ultrasound. A fellow of the American College of Chest Physicians, American Academy of Sleep Medicine and the Society of Critical Care Medicine, Dr. Groth served as the Director of the MICU, Director of Critical Care and Assistant Director of the Sleep Disorders Center at Winthrop-University Hospital before joining Mather in 2009.  Dr. Groth has been an active teacher for more than 20 years and has presented her research findings at conferences around the world.


Joan C. Faro, MDJoan C. Faro, MD is the Chief Medical Officer at Mather Hospital and the President of Harbor View Medical Services, a physician practice group that is part of the Mather Health System. As a member of the hospital’s executive team, Dr. Faro works on a number of initiatives including evaluating and implementing best practices in quality and patient safety, developing physician leaders, motivating change, and developing methodologies for measuring, tracking and reporting both process and outcomes measures to ensure improvement. Dr. Faro believes that physicians must take active roles in designing systems to ensure optimal healthcare delivery and that they should begin preparing themselves for leadership opportunities early in their career. She serves as faculty for the GNYHA Clinical Quality Fellowship Program, designed to deliver formal training in quality improvement principles and techniques to physicians and other healthcare providers. Dr. Faro earned her medical degree from Stony Brook Medicine and completed her residency in Internal Medicine and a fellowship in General Medicine at Stony Brook Hospital. She went on to serve as a member of the Internal Medicine faculty at Stony Brook Medicine from 1985 until 1994. She is a Fellow of the American College of Physicians and has served on several of the national committees of the Society for Hospital Medicine, including Leadership and Quality. She joined APM/CSC Healthcare Consulting in 1994 while earning her MBA from NYU Stern School of Business. She has been at Mather since 2001. In her spare time, Dr. Faro collects wine and enjoys travel, gourmet cooking and a variety of winter sports.

Alan T. Kaell, MDAlan T. Kaell, MDserves as the Director of Resident Scholarly Activity and Faculty Development at Mather Hospital. Board certified in Internal Medicine, Rheumatology and Geriatrics, Dr. Kaell has been an active investigator since 1983, focusing on rheumatology and immunology, resulting in numerous published research articles and chapters. He has lectured on his findings internationally, has had privileges at 4 major hospitals in Suffolk County and has been a reviewer and editor of various national journals for over 30 years. Dr. Kaell has conducted over 20 Phase II, III and IV clinical trials for anti-rheumatic therapies and has been the recipient of NIH and Fetzer research grants. He has taught medical students, residents and fellows for the past 30 years and is currently a participant in the Academy of Rheumatology Medical Educators, whose mission is to develop, implement and assess novel teaching techniques by incorporating Patient Reported Outcomes and evaluating patient and physician behavioral changes.

Michael TofanoMichael Tofano, MD serves as both a core faculty member of the Transitional Year Residency Program and the Program Director of the Internal Medicine Residency Program.  Dr. Tofano completed his residency at St. Vincent’s Hospital and Medical Center in New York. He served as Chief Resident for the academic year 1985-1986, and then completed a cardiology fellowship at Robert Wood Johnson Hospital in New Jersey.  After many years as a practicing cardiologist, Dr. Tofano transitioned to hospital medicine in 2007, at the UMASS Memorial Health Care System in Worcester, MA.  In 2009, he was appointed the Associate Chief of Hospital Medicine for UMASS Memorial Health Care System, and the Director of Hospital Medicine at Marlboro and Clinton Hospitals, members of the UMASS Memorial System, developing quality initiatives in cardiology that led to Marlboro Hospital achieving a number two ranking statewide for AMI survival. Dr. Tofano joined Mather in 2012 as Hospitalist Director, and joined the Residency Program in 2013. In his free time, Dr. Tofano enjoys spending time with his family, playing basketball and baseball with his two sons and frequenting the many fine restaurants in the Port Jefferson area with his wife.

Robert Giacobbe, DORobert Giacobbe, DO serves as both a core faculty member of the Transitional Year Residency Program and as Associate Program Director for the Internal Medicine Residency Program focusing on the residency’s Ambulatory Continuity Practice.  Dr. Giacobbe graduated from New York College of Osteopathic Medicine in 1990, completed a rotating internship at Peninsula Hospital in Queens and an Internal Medicine residency at Winthrop University Hospital.  Dr. Giacobbe joins our faculty after 21 years in private General Internal Medicine practice in Port Jefferson during which time he was an active member of the Mather Medical Staff serving on numerous committees.  He also currently serves as the Medical Director of Mather’s physician group, Harbor View Medical Services and is a strong advocate for high quality Primary Care.  Dr. Giacobbe is also a clinical instructor for Stony Brook Medicine.  In his spare time, he enjoys cycling and spending time with his family.

Halyna Chykyda, MD serves as both a core faculty member of the Transitional Year Residency Program and as an Associate Program Director in the Internal Medicine Residency Program.  A graduate from Ternopil National Medical University in the Ukraine, she completed her internal Medicine residency at Mather Hospital.  She is board certified in Internal Medicine.


Adam Wos, MD serves as both a core faculty member of the Transitional Year Residency Program and as the Medical Director of Emergency Medicine.  He is board certified in Emergency Medicine and is a Fellow of the American College of Emergency Physicians.  He joined the Emergency Medicine Department at Mather Hospital in 2009 as an Attending Physician and served as the Interim Medical Director from 2014 to 2016.



Nancy Nunez, C-TAGMENancy NunezC-TAGME is the Program Coordinator for the Transitional Year Residency Program. She has worked in the healthcare industry for almost 18 years. Prior to joining Mather Hospital in 2014, she was with Interfaith Medical Center for 4 years as the Program Coordinator for the Medical Student Education Program. Ms. Nunez also worked at Wyckoff Heights Medical Center (WHMC) for 12 years as the Program Coordinator for the Internal Medicine Residency Program. During her tenure at WHMC, the IM residency program was approved with its first ever 5-year ACGME accreditation. In her spare time, she enjoys spending time with her family and friends and serving as a mentor to others.