Medical Team

Our Physicians

Nereida Diaz-Johnson MD
Certified by the American Board of Internal Medicine, Dr. Nereida Johnson has practiced medicine in the New York and New Jersey area for more than twenty-five years. She is bilingual, speaking both fluent English and Spanish.

A practicing partner of Union Medical Group, Dr. Diaz-Johnson has attracted a loyal patient following through her years of practice in the community.

Awarded a B.A. in Pre-Medicine, Neurobiology and Human Behavior from Cornell University, she was graduated as a Doctor of Medicine from Mount Sinai Medical Center School of Medicine in 1982.


Clark Philogene, MD, RPh
Dr. Philogene, M.D., earned his medical degree in 1990 and has cared for patients in New Jersey since 1993. He is a board certified internist. A native of Haiti, Dr. Philogene is fluent in English, French and Creole.

Prior to attending medical school, Dr. Philogene attended the Schwartz College of Pharmacy in Brooklyn, earning a Bachelor of Science degree and becoming a Pharmacist in 1982. After being awarded his medical degree in 1990 from New York University at Syracuse, Dr. Philogene performed his Internship and Residency at the University of Medicine and Dentistry in New Brunswick in 1990 and 1991. Along with M. Cappell, M.D., Ph.D., he co-authored the resulting report, which was published in the American Journal of Gastroenterology in June 1993.

Dr. Philogene serves as a Clinical Instructor and Medical Resident at Overlook Hospital.