Rockstar Toronto, formerly Rockstar Canada, was founded in 1999 after being bought from GameTek Canada. The studio already existed since 1988, but under different ownerships. Rockstar Vancouver was merged with Rockstar Toronto in 2012, following Max Payne 3's release.
This studio is mostly known for being the studio who develops the PC versions of Rockstar games (nowadays along with Rockstar North), and for having developed Max Payne 3 and ported Max Payne 2 to the PlayStation 2. They also developed The Warriors.
Presence in the Community
Rockstar Toronto representatives registered at GTAForums in December 2008, to help with GTA IV PC technical issues that arised during its lifetime. Official account at GTAF