He has also worked with all five branches of the United States Armed Forces. An avid researcher, Professor Schallhorn has served as a clinical investigator on numerous Food and Drug Administration (FDA) clinical trials over the past 25-years. He has presented more than 200 clinical papers, made countless presentations throughout America, Europe and Asia, and is the author of numerous academic journal publications and papers.
Before entering medical school, Professor Schallhorn had a successful career as a Naval Aviator and TOP GUN instructor in the US Navy. While at TOP GUN film screenwriter Jack Epps Jr interviewed him for the movie Top Gun. Although the movie is a fictitious portrayal of Naval Aviation, some of the events in the movie were based on stories replayed by Professor Schallhorn.