Dr. Pretorius received his medical degree from the New York University School of Medicine. He completed a residency in internal medicine at the University of Texas Health Science Center in San Antonio and a residency in Nuclear Medicine at the University of California in San Diego.

Dr. Pretorius specializes in endocrinology, metabolism, neuroendocrinology and nuclear medicine. He is a member of the American Association of Clinical Endocrinologists.

Dr. Pretorius is certified by the American Board of Internal Medicine in both internal medicine and endocrinology. He is also certified by the American Board of Nuclear Medicine.