Yuzo Koshiro (古代 祐三, Koshiro Yūzō, born December 12, 1967 in Hino, Tokyo) is a Japanese music composer and president of the game development company Ancient. He is often regarded as one of the most influential innovators in chiptune and video game music, producing music in a number of genres, including various electronic genres (such as breakbeat, electro, hardcore, house, jungle, techno, and trance), experimental, symphonic, hip hop, jazz, and synth-rock. Koshiro and his sister Ayano also founded the game development company Ancient in 1990.