Dr. Marienberg is a board certified radiation oncologist with expertise in hospital-based and free standing clinics. She was awarded her medical degree at Stony Brook University of Medicine in Stony Brook, NY. She completed her residency at University of Miami/Jackson Memorial Hospital. She has experience treating cancers ranging from breast, prostate, lung, brain, skin, sarcomas, gynecological and gastrointestinal malignancies.

Most recently, Dr. Marienberg served as the Physician-in-Chief of radiation medicine at North Shore/Long Island Jewish Health Systems at Glen Cove Hospital. There she held the position of assistant professor, worked as the cancer liaison physician to the American College of Surgeons and as the director of the Radiation Medicine Journal Club.

Dr. Marienberg has been in practice for more than 25 years and, over  the course of her career, has received several Top Doctor Awards and Women in Medicine Awards.