Dr. Mark E. Peterson is well known for his clinical research and teaching in small animal endocrinology. Mark is the owner and director of the Animal Endocrine Clinic, a specialty referral hospital devoted primarily to the diagnosis and treatment of cats with thyroid disease (hyper- and hypothyroidism), where he conducts most of his clinic research. He also serves as adjunct Professor of Medicine at the New York State College of Veterinary Medicine, Cornell University.