Harmon specializes in the management of complex hernias and wounds. However, his many surgical interests include hernias, wound healing, breast cancer, colon and small bowel cancers, stomach cancer, as well as thyroid and parathyroid conditions.Dr. Harmon has been featured in several publications regarding the gastrointestinal organs, including the esophagus, stomach, small intestine and colon. He has also published information dealing with military medicine, specifically blast injuries. Dr. Harmon was one of the first to publish, in his paper on Zollinger Ellison syndrome, the importance of removing tumors. He also was the first to observe an endocrine effect of marijuana. His animal studies of GERD (gastro-esophageal reflux disease) were extensive and helped explain the pathophysiology of the condition.