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Our History

In 1953, Dr. Jerome Zwanger founded his radiology practice with the purpose of providing physicians and patients on Long Island with modern medical diagnostics in a caring and compassionate environment. He began the practice out of his house, which was located where the current Massapequa office now lies.

He began a partnership with Dr. E.J. Pesiri in 1958, which continued until July of 2001, when Dr. Pesiri retired. Dr. Zwanger continued to practice part-time until he retired in June 2008.



Making the Difference Today

Now for over 60 years, Zwanger-Pesiri has been establishing the gold standard in radiology with an unmatched level of patient-centered care, research, education, and commitment to the community. Headed by Steven L. Mendelsohn, M.D.​ and Susan Zwanger-Mendelsohn, M.D.​, Zwanger-Pesiri has surpassed every hospital, every health system, every multi-specialty practice, and every outpatient radiology facility in virtually every facet of radiology. This commitment begins with the patient’s first interaction with the scheduling staff and continues through to the very last communication with the billing specialists.

Zwanger-Pesiri's knowledgeable team of caring professionals is dedicated to providing state-of-the-art radiological services with a level of care unmatched in the industry. They are the national show site for Siemens advanced MRI and CT systems, demonstrating their unsurpassed technology to medical professionals around the country. Their radiologists are subspecialty trained in areas such as Neuroradiology, Musculoskeletal Imaging, Body Imaging and Breast Imaging and work closely with referring physicians to ensure the best outcomes for patients.

Read a recent article about quality and value in radiology from Diagnostic Imaging, written by ZP's CEO, Steven Mendelsohn, M.D.


The Zwanger-Pesiri Advantage

  • Core values of care, compassion and empathy
  • Relaxing, soothing environment focused on patient comfort
  • Ease in scheduling with evening, Saturday and Sunday appointments
  • No appointment necessary for digital X-ray with exams performed on a walk-in basis
  • Same day CT and MRI appointments available
  • Participate with most insurance plans
  • Prompt results and reports