David Doak is a British developer, who's previously worked at the development studio Rare, where he assisted with things level design and artificial intelligence for GoldenEye 007. His face was famously used for the NPC scientist Dr. Doak in the game.
After leaving Rare, he established the company Free Radical Design, which is probably best known for developing the Time Splitters series.
You can meet David Doak at the convention on both Saturday and Sunday. You'll find him here.