Dr. Marsden attended Medical School at the University of Utah. Following medical school, he completed an internship and residency in Emergency Medicine at Maricopa Medical Center in Phoenix, Arizona. After his training, Dr. Marsden stayed on in Phoenix and also joined the faculty staff as a clinical instructor for Emergency Medicine. He also filled the positions of Base Station Medical Director and Medical Director of Pre-hospital Training at Maricopa Medical Center. He has served as chairman of the Emergency Preparedness Committee of Maricopa Medical Center and was the Secretary for the Arizona Emergency Service Association.
Since returning to Utah, Dr. Marsden has served on the Utah ACEP board for over 10 years, including two as President and medical director of Farmington fire for 15 years. He has served as a medical team manager for Utah Urban Search and Rescue Task Force 1 since its inception and was deployed to Katrina. He is on the board of directors of Ascend Alliance through which he has led numerous humanitarian expeditions to South America.
He participated in a self-designed sabbatical with DHS in Washington, DC and has a faculty appointment at George Washington University. During this time he served clinically at Fairfax and Bethesda Naval Hospitals. He has served as co-chair of the ambassador program of the international section of national ACEP.
Dr. Marsden helped establish and is co-chair of the Intermountain Center for Disaster Preparedness at LDS hospital. He also serves on the Physician Advisory Council and is currently the Chairman of the Department of Emergency Medicine at LDS Hospital. He has been a medical staff member of Intermountain Healthcare since 1995.
Dr. Marsden is currently the medical staff president at the LDS Hospital and served as ED medical director for 7 years.