It is with profound sadness that we announce the passing of Dr Arthur D. Hagan. He departed this earth for his heavenly home on July 9, 2026 after a long illness, he was 91. Arthur was born in Pleasanton, Iowa to Roscoe A. and Catherine I. Hagan on December 29, 1934. The family later moved to Corydon, Iowa where he completed his high school education and graduated as Salutatorian in 1953. He enrolled in the University of Iowa two weeks after high school and graduated from the University of Iowa College of Medicine in 1959. He completed his Internship at Broadland Medical Center in Des Moines, Iowa. He joined the US Navy in 1960 and was sent to Pensacola, FL to complete his Naval Flight Surgeon training and serve as a Navy Flight Surgeon. In 1963 thru 1968 he was stationed in San Diego, California where he completed his Internal Medicine Residency and his Fellowship in Cardiovascular Disease and Pediatric Cardiology at the U.S. Naval Medical Center in San Diego, California. From December 1968 thru December 1969, He served as Chief of Cardiology, on the U.S.S. Repose (Navy Hospital Ship) in South Vietnam. He returned after serving to San Diego Naval Hospital and became Director of Non-invasive and Cardiac Catheterization Laboratories. In 1973 he was promoted to Captain and became the Chief of Cardiology where he served in this position until 1977 when he became Director of Clinical Investigation Center for Research and Development. During this time he was invited to lecture internationally and spoke in 12 different countries around the world on the benefits of Cardiac Ultrasound and Echocardiography. The highlight of his career was being invited personally by Dr. Inge Edler and Physicist Hellmuth Hertz, the developers of Medical Ultrasonography and Echocardiography, to lecture at their Symposium on Echocardiography in May of 1977 at Lund University in Lund, Sweden.

Dr. Hagan later authored two textbooks on Echocardiology and had more than 150 scientific articles and papers published in medical journals in the United States and Europe. Dr. Hagan played a critical role in early clinical research, publishing key studies on the haemodynamic effect Echocardiography and helped pioneer and popularize the technique across the US. After retiring from the Navy in 1980 Dr. Hagan served as a Professor of Medicine at the University of Utah School of Medicine and Chief of Cardiology at the LDS Hospital in Salt Lake City. 1984 he was invited to join the Tulsa Heart Center and Hillcrest Hospital in Tulsa, Oklahoma, In 1989 he began an outreach program visiting smaller Oklahoma towns including Stillwater to better serve the community. In 1991 he moved to Stillwater and opened Stillwater Heart Center. In 2010 he became a full time Cardiologist at Stillwater Medical Center. He retired from working in December 2023. He truly enjoyed serving his patients from Stillwater and the surrounding communities. He always said he had the very best staff and colleagues here at Stillwater Medical Center.

During his military service he developed a love for sport parachuting, completing 110 jumps. In his later years he was a huge supporter of his Oklahoma State Cowboys (all sports). He was a 35 year member of the Boston Avenue Methodist Church in Tulsa.

He survived by his wife Shannon Hagan; children, Douglas L. Hagan (Jennifer), Arthur Brett Hagan, Dr. Derek Hagan (Emily), Victoria Lea Arreola (Sergio), and Ren D. Hagan; grandchildren, Kalin M. Adams (Robbin Ingvarsson) and Lauren Adams; great grandchildren, Oliver Ingvarsson and Freya Ingvarsson. He is also survived by his older brother Carlton Hagan and sister-in-law Ann Hagan, and many extended family members. He was proceeded in death by his parents and his daughter Sheree Kim Adams.

Per his request he will have a private graveside service in Iowa and 1/2 of his cremains will be interred beside his parents. The remaining cremains will be interred in Arlington National Cemetery Columbarium.

There will be a local come and go celebration of his life at Strode Funeral Home that date will be published at a later time. Please send any cards or condolences to Strode Funeral Home.

Dr. Hagan requested that in lieu of flowers you can make a small donation in his memory to the Stillwater Medical Foundation