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Dr. Weller is board- certified by the American College of Veterinary Internal Medicine in Internal Medicine (1980) and Oncology (1987), Past Chairperson of the Organizing Committee for the Specialty of Veterinary Medical Oncology, Past Chairperson of the Board of Regents of the American College of Veterinary Internal Medicine, Past President of the Board of Regents of the American College of Veterinary Internal Medicine, Past President of the Specialty of Oncology, and a Charter Member of the Veterinary Cancer Society which he served as Treasurer for 16 years.