A graduate of University School of Medicine, Dr. Pajak completed his internships in Internal Medicine, Surgery, Pediatrics, Gynecology and Intensive Care with City Hospital both in Lublin, Poland. He served as a Clinical Researcher with the Montefiore Medical Center and completed a Fellowship in Neurosurgery with Long Island College Hospital in New York.

Dr. Pajak also completed his Internal Medicine Residency with the University of Massachusetts, Worcester and his Nephrology Fellowship with State University of New York, Stony Brook. Dr. Pajak is Board Certified with the American Board of Internal Medicine.