Prof. A.N. Papyrin is a specialist in gas-dynamics, combustion in high-speed two-phase flows, and new technologies based on the Cold Spray process. He is one of the inventors of the Cold Spray process and for the last twenty years he has performed extensive research in this field leading to advancing the Cold Spray for a broad diffusion to commercial markets. He has over 160 papers, 6 books, and 12 patents.