Dennis received a BS in physics from the University of Illinois. He received a PhD in aerospace engineering from Purdue University. He has extensive experience in research and development on military and industrial projects. He has carried out work in rocket engines, power generation, environmental controls, chemical and biological decontamination, and materials development. As a contract physical scientist at the U.S. Army Research Laboratory, he carries out analytical and experimental work related to weapons and environmental research. This work includes the development of operating parameters and applications for cold spray, as well as mathematical modeling of the cold spray process. Dr. Helfritch is the principal author of over 50 technical papers in journals and symposium proceedings. He holds eleven U.S. Patents.