Alan Hirsch, M.D, F.A.C.P., is a medical practitioner and researcher with dual certification in neurology and psychiatry. He is a Faculty Member in the Department of Medicine at Mercy Hospital and Medical Center, and Assistant Professor in the Departments of Neurology and Psychiatry at Rush Presbyterian St. Luke's Medical Center.

Dr. Hirsch's career has been dedicated to studying the sensory system of the human body. As one of America's foremost researchers on the effects of odors and flavors on human emotion, mood and behavior, he has conducted and published over 180 research studies on sensory phenomena. He has appeared on The Oprah Winfrey Show, CNN, Good Morning America, the CBS Early Show and Extra.

As a leading authority on smell and taste, Dr. Hirsch has dedicated his career to the betterment of his patients' lives. He founded the Smell & Taste Treatment and Research Foundation in Chicago, IL. In his studies, Dr. Hirsch found that patients suffering from head injuries who had lost their sense of smell and taste were gaining weight. His 20-plus years of research regarding the impact of smell and taste on weight loss led him to develop the patent-pending technology used in the Sensa Weight-Loss System. He conducted one of the largest studies of a non-prescription weight-loss system to test the effectiveness of Sensa as a means of weight loss.

5 board certifications as a practicing physician

Nation’s leading authority on the science of smell and taste

Author of 6 books on the science of sensory response

More than 200 published research studies

Featured on Dateline NBC, CNN and The Oprah Winfrey Show

Creator of Sensa and patent-pending Tastant Technology