Joo-Hiuk Son received his BS and MS in electronics engineering from Seoul National University, Seoul, Republic of Korea, in 1986 and 1988, respectively, and his PhD in electrical engineering from the University of Michigan, Ann Arbor, in 1994. His PhD work was on the experimental and theoretical study of transient velocity overshoot dynamics in semiconductors by monitoring femtosecond-laser-driven terahertz pulses. After leaving Michigan, he worked as a postdoctoral scientist at Lawrence Berkeley National Laboratory and the Department of Electrical Engineering and Computer Science, University of California, Berkeley, where he continued his research on the terahertz spectroscopy of semiconductors from 1994 to 1996. In 1997, he joined the Department of Physics at the University of Seoul, Seoul, Republic of Korea, as an assistant professor and was later promoted to professor. In the early years, his research was focused on the characterization of electrical and optical properties of various nanosized materials including carbon nanotubes and graphenes utilizing terahertz time-domain spectroscopy. In recent years, his interest shifted to terahertz electromagnetic interactions with biological materials and their applications in medicine. Combining his expertise on nanomaterials and terahertz medical diagnosis, he invented a highly sensitive terahertz molecular imaging technique using nanoparticle probes. He is an editor of “Terahertz Biomedical Science and Technology” published by CRC Press.