Yongrae Roh received B.S. and M.S. degrees from Seoul National University, Korea, in 1984 and 1986, respectively. He earned his Ph.D. degree in Engineering Science and Mechanics from the Pennsylvania State University, USA, in 1990. From 1990 to 1994, he worked at the Research Institute of Industrial Science & Technology, Korea, as a senior research scientist. He joined Kyungpook National University, Korea, in 1994 and is now a professor in the School of Mechanical Engineering. He has authored more than 220 journal papers and holds 41 patents. His major research areas include piezoelectric devices, medical ultrasonic transducers, and acoustic transducers for underwater SONAR systems.