Geoffrey "Geoff" Lazer Ramsey, is an American voice actor and comedian. He co-founded the production company Rooster Teeth in 2003 and is best known for voicing Dexter Grif in the long-running web series Red vs. Blue.
Geoff is also a voice actor and Internet and YouTube personality. He is also a producer and actor for Rooster Teeth who voiced Dexter Grif on Red vs. Blue for more than 10 seasons. He also co-founded Rooster Teeth's Achievement Hunter, a video gaming division of Rooster Teeth which he manages and hosts for.