Unlike the previous two composers I've posted about, this particular one started even earlier, during the 8-bit era. A compositional legend and a master of FM synthesis, Yuzo Koshiro began his career at Nihon Falcom in 1986.
He didn't stay with Falcom for too long, but he left an incredible legacy. He wrote songs for the games Sorcerian, Ys and Ys II, which although are not very popular outside of Japan, have absolutely incredible music. After his departure from Falcom, he became a freelancer, writing music for games such as Streets of Rage and ActRaiser. In 1990, he helped found Ancient Corp., a game developer which he's currently the manager of.
There isn't too much to be said about Koshiro other than his incredible music. He is, however, a skilled pianist and violinist, and has taken part in various concerts including the premier of PLAY! A Video Game Symphony in Chicago. He arranged music from Sonic the Hedgehog for this event.
Some of his more recent works include the Wangan Midnight Maximum Tune racing games, 7th Dragon, and the Etrian Odyssey series, which he gives a retro, PC-88 FM synthesis style. He also arranged the main theme from The Legend of Zelda for Super Smash Bros. Brawl, as well as Norfair from Metroid. And if you're a Castlevania fan, he did worked with Michiru Yamane to compose some tracks for Portrait of Ruin on the DS.
He truly is an absolute musical genius, and I highly recommend checking out more of his works. Furthermore, I really need to do a post on the Ys series as a whole.
Square Enix Music Online profile