Akira Yamaoka confirmed he has left Konami. No word yet on what he'll end up doing, and according to Square Enix Music Online it would be likely he'll end up a freelance composer like many before him (Norihiko Hibino, Yoko Shimomura and Yasunori Mitsuda to name a few). While this might be a loss for Konami, frankly Silent Hill hasn't been the same for a while. It will no doubt do him good to go freelance and get some different work. If he ceases game composition entirely however he will be sadly missed.1
Yoko Shimomura was born in Hyogo prefecture, Japan. Her parents enrolled her in piano lessons when she was five years old and quickly took to the instrument. After high school, she enrolled as a piano major in Osaka Music University. Upon graduation, she intended on becoming a piano instructor, but, being a fan of video games, she sent some samples of her work to Capcom, who offered her a position. Reportedly, her family members were dismayed with her decision to accept.
In 1993, Shimomura composed her first soundtrack for Squaresoft, the wacky role-playing pastiche Live A Live. Shimomura later tag-teamed with Noriko Matsueda on the strategy/RPG in 1995. In 1996, she composed and arranged Square's last Nintendo-produced game for the Super Famicom game system, Super Mario RPG: Legend of the Seven Stars. In 1998, Shimomura went solo once again for the soundtrack to the RPG Parasite Eve. The following year she composed for Legend of Mana, which began to show a development of her style. She has gone on to achieve wide recognition for her work on the Kingdom Hearts series of games.
Source: Square Enix Music Online