Alexander Kleshchev is a Professor in the Department of Physics at Saint-Petersburg State Navy Technical University, Russia. He is the author of 175 publications and 12 books, including Hydroacoustic Scatterers (1992; 2012), Diffraction and Propagation of Waves on Elastic Media and Bodies (2002), and Diffraction, Radiation, and Propagation of Elastic Waves (2006).