Dr. Arthur D. Hagan graduated from the University of Iowa in 1956 then continued to graduate from the University of Iowa School of Medicine in 1959. He then went on to receive US Navy Flight Surgery Training in 1960. He then spent 20 years in various cardiology positions for the Navy, some of that time in research and some in patient care. He retired from the Navy in 1980 and continued researching and practicing cardiology in other settings. He currently works at the Stillwater Heart Center in Stillwater, Oklahoma.

He has been a cardiologist for the past 36 years conducting research, teaching, and practicing in the U.S. Navy, University Medical Center, and private practice settings. Dr. Hagan has enjoyed his practice but the lack of prevention in the field of cardiology frustrates him. As a result, he passionately seeks the application of proven, natural, and complementary therapies for the prevention of or slowing of the progression of cardiovascular diseases. Accordingly, the Unicity products aimed at improving heart health have become an essential part of his patient care.

Dr. Hagan is a Fellow of the American College of Cardiology. He has published over 100 articles, 29 abstracts, 11 books chapters, and two textbooks.