Dr. Dunn was born in Lead, South Dakota. He attended Creighton University for pre-med and then attended Creighton University School of Medicine. After graduation, he completed his internal medicine residency training and started his private practice in 1968. Dr. Dunn became board-certified in internal medicine and, subsequently, became a fellow of the American College of Medicine and a member of Alpha Omega Alpha Honor Medical Society. In 2006, Dr. Dunn started as a principal investigator at Quality Clinical Research. Dr. Dunn has completed over 250 studies in phase I – IV studies. Dr. Dunn has been recognized in the research industry for his quality data and patient care.