Our Staff

Radiation oncology is different from some medical specialties in that it involves a team of specialists who work very closely together. In addition to Advanced ROS radiation oncologists, Dr. Gerstley and Dr. Torrey, who direct patient treatment and care, we want to introduce you to some other key members of the Therapy Team. All of these people will play an important role in your treatment, and all have exceptional backgrounds in their area of specialization.

Mark Belanich, M.S., D.A.B.R.
Director of Medical Physics

Mark is Horizon Practice Management Consultants' Director of Medical Physics, specializing in Radiology and Radiation Oncology. He oversees the clinical activities of facilities managed by Horizon PMC, including Advanced ROS. He has been influential in increasing Mobile High Dose Rate services, expanding Physics Services to include Diagnostic Radiology, internalizing quality control through monthly and annual calibration services, and implementing the “Record and Verify” system. His team is responsible for overseeing Quality Assurance, Radiation Safety and temporary employment. Mark specializes in recommending state-of-the-art equipment and setting up protocols to enhance Quality Assurance. Mark serves on the Board of Directors of the American Association of Medical Physicists. He also served as President, 1990 and 2002, of Radiological and Medical Physics Society of NY (RAMPS) and as President, 1992, of the Connecticut Area Medical Physics Society (CAMPS).
Christine Garda, R.N., OCN
Director of Nursing

Chris’ work in patient care began when she was only 15. A job as a nurse’s aide in a local nursing home inspired her to pursue a career in nursing. By the time she was out of high school she had finished her Licensed Practical Nurse training. As an LPN, Chris found herself drawn to the challenges of cancer care. After becoming a Registered Nurse and then a Certified Oncology Nurse, she focused on administering cancer treatments and patient care in both inpatient and outpatient settings, including Memorial Sloan Kettering and eventually Advanced ROS. Chris has taken her career to another level through her active involvement with the Oncology Nursing Society. An experienced presenter at ONS annual conferences, she now inspires and educates others by sharing her knowledge and dedication to caring for people with cancer.


Gerald Squillante, B.S., R.T. (T)
Administrator, Site Manager

Jerry came to Advanced ROS after an 18-year tenure as Program Director of the Montefiore Medical Center School of Radiation Therapy Technology. He had previously served as Chief Radiation Therapist at Beth Israel Medical Center in New York City and Staff Radiation Therapist at Mary Immaculate Cancer Center in Jamaica, Queens. His 30 years of experience in every practical aspect of Radiation Therapy combined with his administrative and supervisory background helps ensure that our operation runs smoothly and that our patients report a consistently high level of satisfaction with their treatment experience. Jerry leads our administrative and technical teams, from the people who greet you to the people who treat you.

Andrew Tamas, R.T. (T)
Chief Radiation Therapist

Andrew John Tamas is a graduate of the Montefiore Medical Center School of Radiation Therapy Technology. As part of his clinical education, he interned at the following Medical Centers: NYU, New York Presbyterian, Beth Israel, Montefiore and the Jack D. Weiler Hospital of the Albert Einstein College of Medicine. In 1997, Andrew became a Radiation Therapist, Certified by the American Registry of Radiologic Technologists (ARRT) and licensed by the State of New York. He served as staff radiation therapist at Beth Israel Medical Center for three years before joining Advanced ROS in 2001. Andy stays abreast of the latest technological advances in the field and is a member of the American Society of Radiologic Technologists (ASRT).