Greg J. Harrison is an American avian (bird) veterinarian who[1][2] is noted for having established the US' first all-bird clinic, The Bird Hospital in Lake Worth, Florida. He later was a founder of the company HBD International, Inc. which manufactures the product line Harrison's Bird Foods. Harrison also was a main contributor and editor of several of the field's earliest and most well-known texts including, Avian Medicine: Principles and Applications[3][4] and Clinical Avian Medicine.[5][6] and the Avian Veterinary Compendium.[7]