Toshio Yamamoto (1921-2007) was professor at Nagoya University. He was an internationally acknowledged expert for Rotor Dynamics and Nonlinear Vibrations. Professor Yamamoto published about 130 research papers and a number of books. For his academic achievements, he received one of the highests awards of the Japanese Society of Mechanical Engineering (JSME). Yukio Ishida (born 1948) is professor at Nagoya University. His main research fields are Rotor Dynamics, Nonlinear Dynamics and Vibration Suppressions. During his academic career, he received the Pioneer Award of the Japanese Society of Mechanical Engineering JSME (2001), the Nagai Scientific Foundation Award (2003), the JSME Medal for Outstanding Paper (2006), and the JSME Education Award (2006). Yukio Ishida is editor of the JSME Journal of System Design and Dynamics, and a long-time editor of the Journal of Vibration and Control. Professor Ishida has authored about 120 research papers and several books.