The scribe behind one of the network's highest-rated series will stay on as co-executive producer for at least another two years, simultaneously developing other projects.

HBO is staying in business with George R. R. Martin.

The author behind the network's successful Game of Thrones series has signed a two-year overall deal that will keep him on as co-executive producer for an additional two years, The Hollywood Reporter confirms. Additionally, Martin will develop and produce other projects for HBO.

PHOTOS: 'Game of Thrones' Season 3 Preview

Martin's A Song of Ice and Fire book series serves as source material for Game of Thrones -- and he has twice penned scripts for the drama, which is going into its third season.

Trailing only True Blood in average ratings, Game of Thrones has been a smash for the network. The series averaged a gross audience north of 10.4 million viewers in its second season, with the 2012 finale drawing a record 4.2 million in its first play.

Martin is repped by WME. His longtime manager Vince Gerardis is attached to his HBO deal.

Game of Thrones returns to HBO on March 31.