Short answers, pulled from the story.
Team Silent included Keiichiro Toyama, Gozo Kitao, Akihiro Imamura, Suguru Murakoshi, Kazuhide Nakazawa, Hiroyuki Owaku, Masahiro Ito, Masashi Tsuboyama, Takayoshi Sato, Norihito Hatakeda, Shingo Yuri, and Akira Yamaoka, each credited with a different role across the first four Silent Hill games.
Team Silent made the first four Silent Hill games, released by Konami between 1999 and 2004.
According to an artist who worked on Silent Hill: Homecoming, Konami disbanded Team Silent because the company wanted Western developers to make future Silent Hill games.
Konami merged KCET, short for Konami Computer Entertainment Tokyo, into its parent company in April 2005.
Climax Studios, Double Helix Games, and Vatra Games, all non-Japanese studios, developed later Silent Hill titles after Team Silent's dissolution.
Yes, Akira Yamaoka, Team Silent's series sound director, oversaw and approved specific aspects of the Silent Hill film adaptation throughout its production.