Prof. Efrén M. Benavides is a lecturer at the School of Aeronautics (Universidad Politécnica de Madrid) in mechanical design, reciprocating engines and propulsion systems with research work in the field of aeronautics. These research fields include several topics related with engineering design such as axial compressors, reciprocating engines, thermoacoustics, heat transfer and reliability. Benavides has written several articles about these subjects in a variety of scholarly journals and scientific literature.