Hideki Hirayama received his PhD of Eng. from Tokyo Institute of Technology in 1994. In the same year, he became a research scientist at RIKEN. He became a Team Leader to manage the Terahertz Quantum Device Team in 2005. In 2012, he was appointed as a Chief Scientist of Quantum Optodevice Laboratory. He has also concurrent positions as visiting professor of Saitama University, Tokyo University of Science and Tokushima University. He won a Japan IBM Science Prize in Electronics in 2010, an Ichimura Science Prize in 2011, a Science and Technology Award from the Minister of Education, Culture, Science and Technology in 2014, a Compound Semiconductor Electronics Achievement Award (Prof. Isamu Akasaki Award) of The Japan Society of Applied Physics in 2019, etc. His research focuses on crystal growth of AlGaN/AlN nitride-semiconductors and development of deep-UV LEDs. He is also developing terahertz quantum cascade lasers (THz-QCLs).