James B. Amberson, MD

Vice President of Pathology, Dianon Pathology

Shelton, Connecticut

T (203) 926-7158


Dr Amberson is board certified in anatomic pathology and cytopathology. He received his medical degree from The Johns Hopkins University School of Medicine and completed residency training in pathology at the New York Hospital-Cornell University Medical Center. He was a cytopathology fellow under Leopold Koss, MD, at Montefiore Medical Center, Bronx, NY. He also holds an MBA from Columbia University. Dr Amberson was an assistant professor of pathology at the Cornell University School of Medicine from 1983 to 1989, after which time he became Dianon’s medical director. His area of expertise is uropathology, and he has authored articles about general pathology, urology, flow cytometry, and image cytometry that have been published in various medical and scientific journals. 

Amer K. Abu Alfa, MD

Executive Medical Director of Gastrointestinal Pathology, Dianon Pathology

Shelton, Connecticut

T (203) 926-7110

Dr Abu Alfa is board certified in anatomic and clinical pathology.  He is a graduate of the American University of Beirut Faculty of Medicine. Dr Abu Alfa completed residency training in anatomic and clinical pathology at the University of Chicago Hospitals. He subsequently completed his fellowship training in gastrointestinal and liver pathology at the Yale University School of Medicine. He was a faculty member of the Yale University Department of Pathology prior to joining Dianon Pathology in 1997. Dr Abu Alfa is active in clinical research and has authored several gastrointestinal pathology articles in peer-reviewed pathology journals. He is a member of the United States and Canadian Academy of Pathology, the College of American Pathologists, the American Society for Clinical Pathology, the Gastrointestinal Pathology Society and the American Gastroenterological Association.